RHSA-2022:9082
Vulnerability from csaf_redhat - Published: 2022-12-15 16:27 - Updated: 2026-02-18 16:55Summary
Red Hat Security Advisory: kpatch-patch security update
Severity
Important
Notes
Topic: An update for kpatch-patch is now available for Red Hat Enterprise Linux 9.0 Extended Update Support.
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: This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel.
Security Fix(es):
* kernel: KVM: cmpxchg_gpte can write to pfns outside the userspace region (CVE-2022-1158)
* kernel: openvswitch: integer underflow leads to out-of-bounds write in reserve_sfa_size() (CVE-2022-2639)
* kernel: watch queue race condition can lead to privilege escalation (CVE-2022-2959)
* kernel: nfsd buffer overflow by RPC message over TCP with garbage data (CVE-2022-43945)
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.
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.
A flaw was found in KVM. When updating a guest's page table entry, vm_pgoff was improperly used as the offset to get the page's pfn. As vaddr and vm_pgoff are controllable by user-mode processes, this flaw allows unprivileged local users on the host to write outside the userspace region and potentially corrupt the kernel, resulting in a denial of service condition.
7.0 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:9082
Workaround
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.
An integer coercion error was found in the openvswitch kernel module. Given a sufficiently large number of actions, while copying and reserving memory for a new action of a new flow, the reserve_sfa_size() function does not return -EMSGSIZE as expected, potentially leading to an out-of-bounds write access. This flaw allows a local user to crash or potentially escalate their privileges on the system.
7.8 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:9082
Workaround
To mitigate this issue, it is possible to prevent the affected code from being loaded by blocklisting the openvswitch kernel module. For instructions relating to blocklisting a kernel module, please see https://access.redhat.com/solutions/41278.
A race condition was found in the Linux kernel's watch queue due to a missing lock in the pipe_resize_ring(). The race condition occurs when a thread uses ioctl(IOC_WATCH_QUEUE_SET_SIZE) to resize the pipe buffer and free the old pipe buffer, while another thread uses keyctl() to trigger a notification in the watch queue, calling post_one_notification() and accessing the freed pipe buffer. This flaw allows a local user to crash the system or escalate their privileges on the system.
7.0 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:9082
A buffer overflow flaw was found in the Linux kernel nfsd (network file system) subsystem. The way a user sends RPC over TCP with excess data added at the end of the message could allow a remote user to starve the resources, causing a denial of service.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:9082
References
Acknowledgments
Harbin Institute of Technology
Qiuhao Li
Zhejiang University
Gaoning Pan
Yongkang Jia
Enesdex
Selim Enes Karaduman
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},
{
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"title": "kernel: KVM: cmpxchg_gpte can write to pfns outside the userspace region"
},
{
"cve": "CVE-2022-2639",
"cwe": {
"id": "CWE-681",
"name": "Incorrect Conversion between Numeric Types"
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"ids": [
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"text": "2084479"
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"text": "An integer coercion error was found in the openvswitch kernel module. Given a sufficiently large number of actions, while copying and reserving memory for a new action of a new flow, the reserve_sfa_size() function does not return -EMSGSIZE as expected, potentially leading to an out-of-bounds write access. This flaw allows a local user to crash or potentially escalate their privileges on the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: openvswitch: integer underflow leads to out-of-bounds write in reserve_sfa_size()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The `openvswitch` is not supported out of the Layered Products subscriptions (OCP, OSP, RHV). There are no Layered Products based on Red Hat Enterprise Linux 7 at the present time. Therefore, this CVE is not planned to be addressed on Red Hat Enterprise Linux 7.",
"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://bugzilla.redhat.com/show_bug.cgi?id=2084479"
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{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-2639",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-2639"
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"release_date": "2022-04-15T00:00:00+00:00",
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"category": "vendor_fix",
"date": "2022-12-15T16:27:48+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",
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"title": "kernel: openvswitch: integer underflow leads to out-of-bounds write in reserve_sfa_size()"
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{
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{
"names": [
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"title": "Vulnerability description"
},
{
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"text": "kernel: watch queue race condition can lead to privilege escalation",
"title": "Vulnerability summary"
},
{
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"text": "Red Hat Enterprise Linux 6, 7 and 8 are not affected by this issue as they did not include support for general notification queue.",
"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: watch queue race condition can lead to privilege escalation"
},
{
"cve": "CVE-2022-43945",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2022-11-10T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2141752"
}
],
"notes": [
{
"category": "description",
"text": "A buffer overflow flaw was found in the Linux kernel nfsd (network file system) subsystem. The way a user sends RPC over TCP with excess data added at the end of the message could allow a remote user to starve the resources, causing a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: nfsd buffer overflow by RPC message over TCP with garbage data",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Affected versions of the Red Hat Enterprise Linux are 8.7 and higher, because starting from the 8.7 the affected source code introduced with the errata RHSA-2022:7683.",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2022-43945"
},
{
"category": "external",
"summary": "RHBZ#2141752",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2141752"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2022-43945",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-43945"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-43945",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-43945"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f90497a16e434c2211c66e3de8e77b17868382b8",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f90497a16e434c2211c66e3de8e77b17868382b8"
}
],
"release_date": "2022-10-03T09:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2022-12-15T16:27:48+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",
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"title": "kernel: nfsd buffer overflow by RPC message over TCP with garbage data"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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