rhsa-2018_2948
Vulnerability from csaf_redhat
Published
2018-10-30 12:05
Modified
2024-11-05 20:47
Summary
Red Hat Security Advisory: kernel-alt security, bug fix, and enhancement update
Notes
Topic
An update for kernel-alt is now available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel-alt packages provide the Linux kernel version 4.x.
Security Fix(es):
* An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639, aarch64)
* A flaw named SegmentSmack was found in the way the Linux kernel handled specially crafted TCP packets. A remote attacker could use this flaw to trigger time and calculation expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending specially modified packets within ongoing TCP sessions which could lead to a CPU saturation and hence a denial of service on the system. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port, thus the attacks cannot be performed using spoofed IP addresses. (CVE-2018-5390)
* A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391)
Space precludes documenting all of the security fixes in this advisory. See the descriptions of the remaining security fixes in the related Knowledge Article:
https://access.redhat.com/articles/3658021
For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.
Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639; Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5390 and CVE-2018-5391; Qualys Research Labs for reporting CVE-2018-1120; David Rientjes (Google) for reporting CVE-2018-1000200; and Wen Xu for reporting CVE-2018-1092, CVE-2018-1094, and CVE-2018-1095. The CVE-2018-14619 issue was discovered by Florian Weimer (Red Hat) and Ondrej Mosnacek (Red Hat).
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"id": "CWE-266",
"name": "Incorrect Privilege Assignment"
},
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1548412"
}
],
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{
"category": "description",
"text": "A bug in the 32-bit compatibility layer of the ioctl handling code of the v4l2 video driver in the Linux kernel has been found. A memory protection mechanism ensuring that user-provided buffers always point to a userspace memory were disabled, allowing destination address to be in a kernel space. This flaw could be exploited by an attacker to overwrite a kernel memory from an unprivileged userspace process, leading to privilege escalation.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: v4l2: disabled memory access protection mechanism allowing privilege escalation",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2017-13166"
},
{
"category": "external",
"summary": "RHBZ#1548412",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1548412"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2017-13166",
"url": "https://www.cve.org/CVERecord?id=CVE-2017-13166"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2017-13166",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-13166"
}
],
"release_date": "2017-07-20T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2018-10-30T12:05:20+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"threats": [
{
"category": "impact",
"details": "Important"
}
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"title": "kernel: v4l2: disabled memory access protection mechanism allowing privilege escalation"
},
{
"cve": "CVE-2017-16648",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2017-11-08T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1516257"
}
],
"notes": [
{
"category": "description",
"text": "The dvb frontend management subsystem in the Linux kernel contains a use-after-free which can allow a malicious user to write to memory that may be assigned to another kernel structure. This could create memory corruption, panic, or possibly other side affects.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Use-after-free in drivers/media/dvb-core/dvb_frontend.c",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7, MRG-2 and real-time kernels.\n\nThis issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux kernel-alt package.\n\nFuture Linux kernel updates for the respective releases may address this issue.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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}
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"baseScore": 4.6,
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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"title": "kernel: Use-after-free in drivers/media/dvb-core/dvb_frontend.c"
},
{
"cve": "CVE-2017-17805",
"cwe": {
"id": "CWE-20",
"name": "Improper Input Validation"
},
"discovery_date": "2017-12-20T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1528312"
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"notes": [
{
"category": "description",
"text": "The Salsa20 encryption algorithm in the Linux kernel, before 4.14.8, does not correctly handle zero-length inputs. This allows a local attacker the ability to use the AF_ALG-based skcipher interface to cause a denial of service (uninitialized-memory free and kernel crash) or have an unspecified other impact by executing a crafted sequence of system calls that use the blkcipher_walk API. Both the generic implementation (crypto/salsa20_generic.c) and x86 implementation (arch/x86/crypto/salsa20_glue.c) of Salsa20 are vulnerable.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Salsa20 encryption algorithm does not correctly handle zero-length inputs allowing local attackers to cause denial-of-service",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 as the code with the flaw is not present in the products listed.\n\nThis issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6, 7, its real-time kernel, Red Hat Enterprise MRG 2, Red Hat Enterprise Linux 7 for ARM 64, and Red Hat Enterprise Linux 7 for Power 9 LE. Future Linux kernel updates for the respective releases may address this issue.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: Salsa20 encryption algorithm does not correctly handle zero-length inputs allowing local attackers to cause denial-of-service"
},
{
"cve": "CVE-2017-17806",
"cwe": {
"id": "CWE-391",
"name": "Unchecked Error Condition"
},
"discovery_date": "2017-12-20T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1528323"
}
],
"notes": [
{
"category": "description",
"text": "The HMAC implementation (crypto/hmac.c) in the Linux kernel, before 4.14.8, does not validate that the underlying cryptographic hash algorithm is unkeyed. This allows a local attacker, able to use the AF_ALG-based hash interface (CONFIG_CRYPTO_USER_API_HASH) and the SHA-3 hash algorithm (CONFIG_CRYPTO_SHA3), to cause a kernel stack buffer overflow by executing a crafted sequence of system calls that encounter a missing SHA-3 initialization.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: HMAC implementation does not validate that the underlying cryptographic hash algorithm is unkeyed allowing local attackers to cause denial-of-service",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, and 7, its real-time kernel and Red Hat Enterprise MRG 2.\n\nThis issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE. Future Linux kernel updates for the respective releases may address this issue.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2017-17806",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-17806"
}
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"release_date": "2017-11-29T00:00:00+00:00",
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"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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},
{
"cve": "CVE-2017-18075",
"cwe": {
"id": "CWE-628",
"name": "Function Call with Incorrectly Specified Arguments"
},
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"text": "1539508"
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{
"category": "description",
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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Mishandled freeing of instances in pcrypt.c can allow a local user to cause a denial of service",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, and 7, its real-time kernel and Red Hat Enterprise MRG 2, as the code with the flaw is not enabled and is not built in the products listed.\n\nThis issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE. Future Linux kernel updates for the respective releases may address this issue.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"category": "self",
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},
{
"category": "external",
"summary": "RHBZ#1539508",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1539508"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2017-18075",
"url": "https://www.cve.org/CVERecord?id=CVE-2017-18075"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2017-18075",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-18075"
}
],
"release_date": "2017-12-20T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2018-10-30T12:05:20+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"scope": "UNCHANGED",
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"title": "kernel: Mishandled freeing of instances in pcrypt.c can allow a local user to cause a denial of service"
},
{
"cve": "CVE-2017-18208",
"cwe": {
"id": "CWE-835",
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"title": "Vulnerability description"
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{
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"text": "kernel: Inifinite loop vulnerability in mm/madvise.c:madvise_willneed() function allows local denial of service",
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},
{
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"title": "kernel: Inifinite loop vulnerability in mm/madvise.c:madvise_willneed() function allows local denial of service"
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{
"cve": "CVE-2017-18344",
"cwe": {
"id": "CWE-125",
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"text": "The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel doesn\u0027t properly validate the sigevent-\u003esigev_notify field, which leads to out-of-bounds access in the show_timer function.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"url": "https://access.redhat.com/errata/RHSA-2018:2948"
},
{
"category": "workaround",
"details": "Attached to this bugzilla is a systemtap script that will prevent opening (and therefore reading) the /proc/\u003cprocess\u003e/timers file which is used to leak information.\n\nThe SystemTap script is relatively small and efficient, broken into 3 distinct sections as follows:\n\n--------\n\nprobe kernel.function(\"proc_timers_open@fs/proc/base.c\").return { \n // this is -EACCES\n\t$return = -13;\n message = sprintf(\"CVE-2017-18344 mitigation denied access to %s to %s(%d)\", file_name , execname(), pid());\n // print a warning message at KERN_INFO debug level\n printk(6, message);\n}\n\nprobe begin {\n printk(6, \"Mitigation for CVE-2017-18344 loaded.\\n\");\n}\n\n\nprobe end {\n printk(6, \"Mitigation for CVE-2017-18344 unloaded.\\n\");\n}\n\n\n---------\n\nFirst, the script places a probe at the return of the kernel function \u201cproc_timers_open\u201d when called. This modifies the return value to be EACCES which would return this value to userspace preventing this file from being opened. When the /proc/\u003cpid\u003e/timer file is attempted to be opened, a message will be logged to the kernel log subsystem showing the process and pid of the application attempting to access the timer file. \n\nThis file is not in widespread use at this time, although some applications may read from it to debug or understand their own timers that are set. This mitigation will not be useful in this context.\n\nFinally, the \u201cprobe begin\u201d and \u201cprobe end\u201d code blocks tell systemtap to add the supplied text to the kernel log buffer via the printk function. This creates an audit trail by registering in the system logs exactly when the mitigation is loaded and unloaded. This will need to be compiled with guru mode (-g parameter) to compile.\n\nThis will need to be loaded at each boot to remain effective. Red Hat Product security recommends updating to a patched kernel when it is available.\n\nRed Hat always seeks to provide both mitigations to disable attacks as well as the actual patches to treat the flaw. To learn more about SystemTap, and how it can be used in your management of your Red Hat systems, please refer to Using SystemTap[1] or one of our videos about it within our Customer Portal[2].\n\n1 - https://access.redhat.com/articles/17839\n2 - https://access.redhat.com/search/#/?q=systemtap",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
"version": "3.0"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c"
},
{
"cve": "CVE-2018-1065",
"cwe": {
"id": "CWE-476",
"name": "NULL Pointer Dereference"
},
"discovery_date": "2018-02-22T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1547824"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the netfilter/iptables subsystem. A user with the netfilter modification capabilities could insert a rule which could panic the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: netfilter: xtables NULL pointer dereference in ip6_tables.c:ip6t_do_table() leading to a crash",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2018-1065"
},
{
"category": "external",
"summary": "RHBZ#1547824",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1547824"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2018-1065",
"url": "https://www.cve.org/CVERecord?id=CVE-2018-1065"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-1065",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-1065"
}
],
"release_date": "2018-02-04T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2018-10-30T12:05:20+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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{
"cve": "CVE-2018-1068",
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"ids": [
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{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s implementation of 32-bit syscall interface for bridging. This allowed a privileged user to arbitrarily write to a limited range of kernel memory.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Out-of-bounds write via userland offsets in ebt_entry struct in netfilter/ebtables.c",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"title": "kernel: NULL pointer dereference in ext4/xattr.c:ext4_xattr_inode_hash() causes crash with crafted ext4 image"
},
{
"acknowledgments": [
{
"names": [
"Wen Xu"
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}
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"id": "CWE-476",
"name": "NULL Pointer Dereference"
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"ids": [
{
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"text": "1560793"
}
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{
"category": "description",
"text": "The Linux kernel is vulnerable to an out-of-bound access bug in the fs/posix_acl.c:get_acl() function. An attacker could trick a legitimate user or a privileged attacker could exploit this to cause a system crash or other unspecified impact with a crafted ext4 image. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: out-of-bound access in fs/posix_acl.c:get_acl() causes crash with crafted ext4 image",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
"cve": "CVE-2018-1118",
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"id": "CWE-200",
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"text": "1573699"
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{
"category": "description",
"text": "The Linux kernel does not properly initialize memory in messages passed between virtual guests and the host operating system in the vhost/vhost.c:vhost_new_msg() function. This can allow local privileged users to read some kernel memory contents when reading from the /dev/vhost-net device file.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: vhost: Information disclosure in vhost/vhost.c:vhost_new_msg()",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"category": "self",
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},
{
"category": "external",
"summary": "RHBZ#1573699",
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{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2018-1118"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-1118",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-1118"
}
],
"release_date": "2018-04-23T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2018-10-30T12:05:20+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"scope": "UNCHANGED",
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"vectorString": "CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N",
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},
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"title": "kernel: vhost: Information disclosure in vhost/vhost.c:vhost_new_msg()"
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{
"acknowledgments": [
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"notes": [
{
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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: fuse-backed file mmap-ed onto process cmdline arguments causes denial of service",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
"category": "external",
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"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 2.8,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
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"details": "Moderate"
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"title": "kernel: fuse-backed file mmap-ed onto process cmdline arguments causes denial of service"
},
{
"acknowledgments": [
{
"names": [
"Jann Horn"
],
"organization": "Google Project Zero"
},
{
"names": [
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"organization": "Microsoft Security Response Center"
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"ids": [
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"text": "1566890"
}
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"notes": [
{
"category": "description",
"text": "An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load \u0026 Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor\u0027s data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "hw: cpu: speculative store bypass",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/ssbd",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"title": "hw: cpu: speculative store bypass"
},
{
"cve": "CVE-2018-5344",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2018-01-12T00:00:00+00:00",
"ids": [
{
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"text": "1533909"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s handling of loopback devices. An attacker, who has permissions to setup loopback disks, may create a denial of service or other unspecified actions.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: drivers/block/loop.c mishandles lo_release serialization allowing denial-of-service",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6.\n\nThis issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2.\n\nFuture Linux kernel updates for the respective releases may address this issue.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-5344"
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"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"title": "Vulnerability description"
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{
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"title": "Statement"
},
{
"category": "general",
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"title": "CVSS score applicability"
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{
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{
"category": "external",
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{
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"category": "vendor_fix",
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"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2018-5391"
},
{
"category": "external",
"summary": "RHBZ#1609664",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1609664"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2018-5391",
"url": "https://www.cve.org/CVERecord?id=CVE-2018-5391"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-5391",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-5391"
},
{
"category": "external",
"summary": "https://access.redhat.com/articles/3553061",
"url": "https://access.redhat.com/articles/3553061"
},
{
"category": "external",
"summary": "https://www.kb.cert.org/vuls/id/641765",
"url": "https://www.kb.cert.org/vuls/id/641765"
}
],
"release_date": "2018-08-14T16:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2018-10-30T12:05:20+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2018:2948"
},
{
"category": "workaround",
"details": "One may change the default 4MB and 3MB values of net.ipv4.ipfrag_high_thresh and net.ipv4.ipfrag_low_thresh (and their ipv6 counterparts net.ipv6.ipfrag_high_thresh and net.ipv6.ipfrag_low_thresh) to 256 kB and 192 kB (respectively) or below. Tests show some to significant CPU saturation drop during an attack, depending on a hardware, configuration and environment.\n\nThere can be some impact on performance though, due to ipfrag_high_thresh of 262144 bytes, as only two 64K fragments can fit in the reassembly queue at the same time. For example, there is a risk of breaking applications that rely on large UDP packets.\n\nSee the Mitigation section in the https://access.redhat.com/articles/3553061 article for the script to quickly change to/from default and lower settings.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.0"
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack)"
},
{
"cve": "CVE-2018-5750",
"cwe": {
"id": "CWE-200",
"name": "Exposure of Sensitive Information to an Unauthorized Actor"
},
"discovery_date": "2018-01-26T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1539706"
}
],
"notes": [
{
"category": "description",
"text": "The acpi_smbus_hc_add function in drivers/acpi/sbshc.c in the Linux kernel, through 4.14.15, allows local users to obtain sensitive address information by reading dmesg data from an SBS HC printk call.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Kernel address information leak in drivers/acpi/sbshc.c:acpi_smbus_hc_add() function potentially allowing KASLR bypass",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, and Red Hat Enterprise MRG 2, as KASLR feature is not present or enabled in these products.\n\nThis issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7, its real-time kernel, Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE. Future Linux kernel updates for the respective releases may address this issue.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"title": "kernel: Kernel address information leak in drivers/acpi/sbshc.c:acpi_smbus_hc_add() function potentially allowing KASLR bypass"
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{
"cve": "CVE-2018-5803",
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"title": "Vulnerability description"
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{
"category": "summary",
"text": "kernel: Missing length check of payload in net/sctp/sm_make_chunk.c:_sctp_make_chunk() function allows denial of service",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"title": "kernel: Missing length check of payload in net/sctp/sm_make_chunk.c:_sctp_make_chunk() function allows denial of service"
},
{
"cve": "CVE-2018-5848",
"cwe": {
"id": "CWE-120",
"name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
},
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"ids": [
{
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"text": "1590799"
}
],
"notes": [
{
"category": "description",
"text": "In the function wmi_set_ie() in the Linux kernel the length validation code does not handle unsigned integer overflow properly. As a result, a large value of the \u2018ie_len\u2019 argument can cause a buffer overflow and thus a memory corruption leading to a system crash or other or unspecified impact. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: buffer overflow in drivers/net/wireless/ath/wil6210/wmi.c:wmi_set_ie() may lead to memory corruption",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-5848"
}
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"category": "vendor_fix",
"date": "2018-10-30T12:05:20+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"cve": "CVE-2018-7566",
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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: race condition in snd_seq_write() may lead to UAF or OOB-access",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5.\n\nThis issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6, 7, its real-time kernel, Red Hat Enterprise MRG 2, Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE. Future Linux kernel updates for the respective releases may address this issue.",
"title": "Statement"
},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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{
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},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-7566",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-7566"
}
],
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{
"category": "vendor_fix",
"date": "2018-10-30T12:05:20+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"title": "Vulnerability summary"
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"title": "kernel: Invalid pointer dereference in xfs_ilock_attr_map_shared() when mounting crafted xfs image allowing denial of service"
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{
"cve": "CVE-2018-10877",
"cwe": {
"id": "CWE-125",
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{
"category": "description",
"text": "A flaw was found in the Linux kernel ext4 filesystem. An out-of-bound access is possible in the ext4_ext_drop_refs() function when operating on a crafted ext4 filesystem image.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: out-of-bound access in ext4_ext_drop_refs function with a crafted ext4 image",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"title": "kernel: out-of-bound access in ext4_ext_drop_refs function with a crafted ext4 image"
},
{
"cve": "CVE-2018-10878",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1596802"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s ext4 filesystem. A local user can cause an out-of-bounds write and a denial of service or unspecified other impact is possible by mounting and operating a crafted ext4 filesystem image.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: out-of-bound write in ext4_init_block_bitmap function with a crafted ext4 image",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: use-after-free detected in ext4_xattr_set_entry with a crafted file",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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{
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2018-10879"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-10879",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-10879"
}
],
"release_date": "2018-06-08T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2018-10-30T12:05:20+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"title": "kernel: use-after-free detected in ext4_xattr_set_entry with a crafted file"
},
{
"cve": "CVE-2018-10880",
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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: stack-out-of-bounds write in ext4_update_inline_data function",
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},
{
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"title": "kernel: stack-out-of-bounds write in jbd2_journal_dirty_metadata function"
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"cve": "CVE-2018-10940",
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"id": "CWE-119",
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"title": "Vulnerability description"
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{
"category": "summary",
"text": "kernel: incorrect memory bounds check in drivers/cdrom/cdrom.c",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"title": "kernel: incorrect memory bounds check in drivers/cdrom/cdrom.c"
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{
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"cwe": {
"id": "CWE-121",
"name": "Stack-based Buffer Overflow"
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"ids": [
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"text": "1583210"
}
],
"notes": [
{
"category": "description",
"text": "The sr_do_ioctl function in drivers/scsi/sr_ioctl.c in the Linux kernel allows local users to cause a denial of service via a stack-based buffer overflow or possibly have unspecified other impact because sense buffers have different sizes at the CDROM layer and the SCSI layer.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Stack-based buffer overflow in drivers/scsi/sr_ioctl.c allows denial of service or other unspecified impact",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"title": "kernel: Missing check in fs/inode.c:inode_init_owner() does not clear SGID bit on non-directories for non-members"
},
{
"acknowledgments": [
{
"names": [
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
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"notes": [
{
"category": "description",
"text": "A flaw was found in the crypto subsystem that allowed an attacker \r\nto crash the system or possibly escalate privileges with a specially crafted program.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: crash (possible privesc) in kernel crypto api.",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: a bug in ip_frag_reasm() can cause a crash in ip_do_fragment()",
"title": "Vulnerability summary"
},
{
"category": "general",
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"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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"title": "kernel: a bug in ip_frag_reasm() can cause a crash in ip_do_fragment()"
},
{
"cve": "CVE-2018-1000026",
"cwe": {
"id": "CWE-20",
"name": "Improper Input Validation"
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"ids": [
{
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"text": "1541846"
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{
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"text": "Improper validation in the bnx2x network card driver of the Linux kernel version 4.15 can allow for denial of service (DoS) attacks via a packet with a gso_size larger than ~9700 bytes. Untrusted guest VMs can exploit this vulnerability in the host machine, causing a crash in the network card.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Improper validation in bnx2x network card driver can allow for denial of service attacks via crafted packet",
"title": "Vulnerability summary"
},
{
"category": "other",
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"title": "Statement"
},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"title": "kernel: Improper validation in bnx2x network card driver can allow for denial of service attacks via crafted packet"
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{
"acknowledgments": [
{
"names": [
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"organization": "Google"
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"cwe": {
"id": "CWE-476",
"name": "NULL Pointer Dereference"
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"ids": [
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"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel where an out of memory (oom) killing of a process that has large spans of mlocked memory can result in deferencing a NULL pointer, leading to denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: NULL pointer dereference on OOM kill of large mlocked process",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"title": "kernel: NULL pointer dereference on OOM kill of large mlocked process"
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{
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"cwe": {
"id": "CWE-200",
"name": "Exposure of Sensitive Information to an Unauthorized Actor"
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"ids": [
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"system_name": "Red Hat Bugzilla ID",
"text": "1589324"
}
],
"notes": [
{
"category": "description",
"text": "A malformed SG_IO ioctl issued for a SCSI device in the Linux kernel leads to a local kernel data leak manifesting in up to approximately 1000 memory pages copied to the userspace. The problem has limited scope as non-privileged users usually have no permissions to access SCSI device files.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Infoleak caused by incorrect handling of the SG_IO ioctl",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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]
}
],
"threats": [
{
"category": "impact",
"details": "Low"
}
],
"title": "kernel: Infoleak caused by incorrect handling of the SG_IO ioctl"
}
]
}
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- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.