RHSA-2022:8941
Vulnerability from csaf_redhat - Published: 2022-12-13 09:37 - Updated: 2026-06-28 12:37Summary
Red Hat Security Advisory: kernel-rt security and bug fix update
Severity
Important
Notes
Topic: An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2 Telecommunications Update Service.
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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
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)
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):
* kernel-rt: update RT source tree to the latest RHEL-8.2.z22 Batch (BZ#2138929)
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)
Affected products
Fixed
30 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-0:4.18.0-193.95.1.rt13.146.el8_2.src | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-core-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-debug-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-debug-core-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-debug-debuginfo-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-debug-devel-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-debug-kvm-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-debug-modules-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-debug-modules-extra-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-debuginfo-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-debuginfo-common-x86_64-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-devel-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-kvm-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-modules-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: NFV-8.2.0.Z.TUS:kernel-rt-modules-extra-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-0:4.18.0-193.95.1.rt13.146.el8_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-core-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-debug-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-debug-core-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-debug-debuginfo-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-debug-devel-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-debug-modules-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-debug-modules-extra-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-debuginfo-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-debuginfo-common-x86_64-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-devel-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-modules-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: RT-8.2.0.Z.TUS:kernel-rt-modules-extra-0:4.18.0-193.95.1.rt13.146.el8_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
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)
Affected products
Fixed
30 products, the same list as for
CVE-2022-1158
Threats
Impact
Important
References
14 references
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"names": [
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"organization": "Harbin Institute of Technology"
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{
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"Yongkang Jia"
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"organization": "Zhejiang University"
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"name": "Use After Free"
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"discovery_date": "2022-03-29T00:00:00+00:00",
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"text": "2069793"
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{
"category": "description",
"text": "A flaw was found in KVM. When updating a guest\u0027s page table entry, vm_pgoff was improperly used as the offset to get the page\u0027s 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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: KVM: cmpxchg_gpte can write to pfns outside the userspace region",
"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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{
"category": "external",
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{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2022/04/08/4",
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"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.",
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2022-2639"
},
{
"category": "external",
"summary": "RHBZ#2084479",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2084479"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2022-2639",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-2639"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-2639",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-2639"
}
],
"release_date": "2022-04-15T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2022-12-13T09:37:20+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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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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