rhsa-2019_4154
Vulnerability from csaf_redhat
Published
2019-12-10 12:06
Modified
2024-11-05 21:40
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):
* Kernel: KVM: OOB memory access via mmio ring buffer (CVE-2019-14821)
* kernel: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows local users to cause a denial of service (CVE-2017-18203)
* kernel: use-after-free Read in vhost_transport_send_pkt (CVE-2018-14625)
* kernel: Information leak in cdrom_ioctl_drive_status (CVE-2018-16658)
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):
* IPMI use after free issue seen on Marvell ThunderX2 (BZ#1732163)
* kernel: siginfo delivers SEGV_MAPERR instead of SEGV_ACCERR [rhel-alt-7.6.z] (BZ#1757189)
Enhancement(s):
* [Marvell 7.7 z-stream BUG] CN99xx: DIMM label not extracted in EDAC hw error log (BZ#1721427)
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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"text": "The kernel-alt packages provide the Linux kernel version 4.x.\n\nSecurity Fix(es):\n\n* Kernel: KVM: OOB memory access via mmio ring buffer (CVE-2019-14821)\n\n* kernel: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows local users to cause a denial of service (CVE-2017-18203)\n\n* kernel: use-after-free Read in vhost_transport_send_pkt (CVE-2018-14625)\n\n* kernel: Information leak in cdrom_ioctl_drive_status (CVE-2018-16658)\n\nFor 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.\n\nBug Fix(es):\n\n* IPMI use after free issue seen on Marvell ThunderX2 (BZ#1732163)\n\n* kernel: siginfo delivers SEGV_MAPERR instead of SEGV_ACCERR [rhel-alt-7.6.z] (BZ#1757189)\n\nEnhancement(s):\n\n* [Marvell 7.7 z-stream BUG] CN99xx: DIMM label not extracted in EDAC hw error log (BZ#1721427)",
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"name": "Uncontrolled Resource Consumption"
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"ids": [
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"text": "1550811"
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{
"category": "description",
"text": "The Linux kernel, before version 4.14.3, is vulnerable to a denial of service in drivers/md/dm.c:dm_get_from_kobject() which can be caused by local users leveraging a race condition with __dm_destroy() during creation and removal of DM devices. Only privileged local users (with CAP_SYS_ADMIN capability) can directly perform the ioctl operations for dm device creation and removal and this would typically be outside the direct control of the unprivileged attacker.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows local users 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, as the code with the flaw is not present in this product.",
"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: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows local users to cause a denial of service"
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{
"cve": "CVE-2018-14625",
"cwe": {
"id": "CWE-362",
"name": "Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)"
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"ids": [
{
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"notes": [
{
"category": "description",
"text": "A flaw was found where an attacker may be able to have an uncontrolled read to kernel-memory from within a vm guest. A race condition between connect() and close() function may allow an attacker using the AF_VSOCK protocol to gather a 4 byte information leak or possibly impersonate AF_VSOCK messages destined to other clients or leak kernel memory.",
"title": "Vulnerability description"
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{
"category": "summary",
"text": "kernel: use-after-free Read in vhost_transport_send_pkt",
"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: use-after-free Read in vhost_transport_send_pkt"
},
{
"cve": "CVE-2018-16658",
"cwe": {
"id": "CWE-200",
"name": "Exposure of Sensitive Information to an Unauthorized Actor"
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"ids": [
{
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"text": "1627731"
}
],
"notes": [
{
"category": "description",
"text": "An information leak was discovered in the Linux kernel in cdrom_ioctl_drive_status() function in drivers/cdrom/cdrom.c that could be used by local attackers to read kernel memory at certain location.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Information leak in cdrom_ioctl_drive_status",
"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: Information leak in cdrom_ioctl_drive_status"
},
{
"acknowledgments": [
{
"names": [
"Matt Delco"
],
"organization": "Google.com"
}
],
"cve": "CVE-2019-14821",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2019-08-28T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1746708"
}
],
"notes": [
{
"category": "description",
"text": "An out-of-bounds access issue was found in the way Linux kernel\u0027s KVM hypervisor implements the Coalesced MMIO write operation. It operates on an MMIO ring buffer \u0027struct kvm_coalesced_mmio\u0027 object, wherein write indices \u0027ring-\u003efirst\u0027 and \u0027ring-\u003elast\u0027 value could be supplied by a host user-space process. An unprivileged host user or process with access to \u0027/dev/kvm\u0027 device could use this flaw to crash the host kernel, resulting in a denial of service or potentially escalating privileges on the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "Kernel: KVM: OOB memory access via mmio ring buffer",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue requires unprivileged users to have access to \u0027/dev/kvm\u0027 device. So restricting access to \u0027/dev/kvm\u0027 device to known trusted users could limit its exploitation by untrusted users/processes.",
"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"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2019-14821"
},
{
"category": "external",
"summary": "RHBZ#1746708",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1746708"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-14821",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-14821"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-14821",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-14821"
}
],
"release_date": "2019-09-17T17:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2019-12-10T12:06:06+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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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.0"
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "Kernel: KVM: OOB memory access via mmio ring buffer"
}
]
}
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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.