rhsa-2019_0831
Vulnerability from csaf_redhat
Published
2019-04-23 14:31
Modified
2024-11-05 21:03
Summary
Red Hat Security Advisory: kernel-alt security and bug fix 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):
* kernel: lack of check for mmap minimum address in expand_downwards in mm/mmap.c leads to NULL pointer dereferences exploit on non-SMAP platforms (CVE-2019-9213)
* kernel: use-after-free in ucma_leave_multicast in drivers/infiniband/core/ucma.c (CVE-2018-14734)
* kernel: Unprivileged users able to inspect kernel stacks of arbitrary tasks (CVE-2018-17972)
* kernel: TLB flush happens too late on mremap (CVE-2018-18281)
* kernel: Type confusion in drivers/tty/n_tty.c allows for a denial of service (CVE-2018-18386)
* kernel: userfaultfd bypasses tmpfs file permissions (CVE-2018-18397)
* kernel: Integer overflow in the alarm_timer_nsleep function (CVE-2018-13053)
* kernel: NULL pointer dereference in xfs_da_shrink_inode function (CVE-2018-13094)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
* Failed to boot with ftrace=function in kvm with 2vcpu (BZ#1501024)
* [ALT-7.5][x86_64] perf test 63 - inet_pton fails on x86_64 (BZ#1518836)
* BUG: potential out-of-bounds string access when forcing a SELinux label on a file (BZ#1595706)
* stack out-of-bounds in smb{2,3}_create_lease_buf() on SMB2/SMB3 mounts (BZ#1598757)
* [ALT-7.6][KVM][PANIC] ltp/lite proc01 - Unable to handle kernel paging request at virtual address ffff7fe000200018 (BZ#1623193)
* Kernel lock up due to read/write lock (BZ#1636261)
* [RHEL-ALT] Fix potential Spectre v1 in tty code (BZ#1639679)
* [Huawei AArch64 7.6 Bug] HNS3: Vlan on HNS3 NIC cannot communicate (BZ#1639713)
* [RHEL7.6-ALT][AWS] backport "nvme: update timeout module parameter type" (BZ#1654958)
* ignore STABLE_FLAG of rmap_item->address in rmap_walk_ksm (BZ#1663565)
* RHEL-Alt-7.6 - kernel: zcrypt: fix specification exception on z196 at ap probe (BZ#1670018)
* [Huawei AArch64 7.6 Bug] Flock over NFSv3 failed (BZ#1670650)
* [Huawei AArch64 7.6/7.6-z Bug] HNS3: if a single transmit packet(skb) has more than 8 frags, will cause the NIC to be unavailable (BZ#1677643)
* krb5{,i,p} doesn't work with older enctypes on aarch64 (BZ#1678922)
Users of kernel are advised to upgrade to these updated packages, which fix these bugs.
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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"name": "Integer Overflow or Wraparound"
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"discovery_date": "2018-07-02T00:00:00+00:00",
"ids": [
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"text": "1597747"
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{
"category": "description",
"text": "A flaw was found in the alarm_timer_nsleep() function in kernel/time/alarmtimer.c in the Linux kernel. The ktime_add_safe() function is not used and an integer overflow can happen causing an alarm not to fire or possibly a denial-of-service if using a large relative timeout.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Integer overflow in the alarm_timer_nsleep function",
"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: Integer overflow in the alarm_timer_nsleep function"
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{
"cve": "CVE-2018-13094",
"cwe": {
"id": "CWE-476",
"name": "NULL Pointer Dereference"
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1597771"
}
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{
"category": "description",
"text": "An issue was discovered in the XFS filesystem in fs/xfs/libxfs/xfs_attr_leaf.c in the Linux kernel. A NULL pointer dereference may occur for a corrupted xfs image after xfs_da_shrink_inode() is called with a NULL bp. This can lead to a system crash and a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: NULL pointer dereference in xfs_da_shrink_inode function",
"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 in xfs_da_shrink_inode function"
},
{
"cve": "CVE-2018-14734",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2018-07-30T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1611005"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux Kernel in the ucma_leave_multicast() function in drivers/infiniband/core/ucma.c which allows access to a certain data structure after freeing it in ucma_process_join(). This allows an attacker to cause a use-after-free bug and to induce kernel memory corruption, leading to a system crash or other 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: use-after-free in ucma_leave_multicast in drivers/infiniband/core/ucma.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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{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-14734",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-14734"
}
],
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{
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"date": "2019-04-23T14:31:19+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 in ucma_leave_multicast in drivers/infiniband/core/ucma.c"
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{
"cve": "CVE-2018-17972",
"cwe": {
"id": "CWE-200",
"name": "Exposure of Sensitive Information to an Unauthorized Actor"
},
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"ids": [
{
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"text": "1636349"
}
],
"notes": [
{
"category": "description",
"text": "An issue was discovered in the proc_pid_stack function in fs/proc/base.c in the Linux kernel. An attacker with a local account can trick the stack unwinder code to leak stack contents to userspace. The fix allows only root to inspect the kernel stack of an arbitrary task.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Unprivileged users able to inspect kernel stacks of arbitrary tasks",
"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": "vendor_fix",
"date": "2019-04-23T14:31:19+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 description"
},
{
"category": "summary",
"text": "kernel: TLB flush happens too late on mremap",
"title": "Vulnerability summary"
},
{
"category": "general",
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"title": "CVSS score applicability"
}
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"category": "self",
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"url": "https://access.redhat.com/security/cve/CVE-2018-18281"
},
{
"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1645121"
},
{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2018-18281"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-18281",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-18281"
}
],
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{
"category": "vendor_fix",
"date": "2019-04-23T14:31:19+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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{
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"name": "Access of Resource Using Incompatible Type (\u0027Type Confusion\u0027)"
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"title": "Vulnerability description"
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{
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"title": "kernel: Type confusion in drivers/tty/n_tty.c allows for a denial of service"
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"cve": "CVE-2018-18397",
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"name": "Improper Input Validation"
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{
"category": "description",
"text": "A flaw was found in the Linux kernel with files on tmpfs and hugetlbfs. An attacker is able to bypass file permissions on filesystems mounted with tmpfs/hugetlbs to modify a file and possibly disrupt normal system behavior. At this time there is an understanding there is no crash or privilege escalation but the impact of modifications on these filesystems of files in production systems may have adverse affects.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: userfaultfd bypasses tmpfs file permissions",
"title": "Vulnerability summary"
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{
"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: userfaultfd bypasses tmpfs file permissions"
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{
"cve": "CVE-2019-9213",
"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 mmap in the Linux kernel allowing the process to map a null page. This allows attackers to abuse this mechanism to turn null pointer dereferences into workable exploits.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: lack of check for mmap minimum address in expand_downwards in mm/mmap.c leads to NULL pointer dereferences exploit on non-SMAP platforms",
"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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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.0"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: lack of check for mmap minimum address in expand_downwards in mm/mmap.c leads to NULL pointer dereferences exploit on non-SMAP platforms"
}
]
}
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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.