RHSA-2026:55618
Vulnerability from csaf_redhat - Published: 2026-08-17 14:25 - Updated: 2026-08-18 15:40Summary
Red Hat Security Advisory: kpatch-patch-6_12_0-211_16_1 security update
Severity
Important
Notes
Topic: An update for kpatch-patch-6_12_0-211_16_1 is now available for Red Hat Enterprise Linux 10.
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 can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-6.12.0-211.16.1.el10_2.
Security Fix(es):
* kernel: rxrpc: Fix RxGK token loading to check bounds (CVE-2026-31641)
* kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() (CVE-2026-43038)
* kernel: netfilter: flowtable: strictly check for maximum number of actions (CVE-2026-43329)
* kernel: netfilter: nft_inner: Fix IPv6 inner_thoff desync (CVE-2026-46244)
* kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle (CVE-2026-64530)
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 the Linux kernel's rxrpc subsystem. An unprivileged local user could exploit an integer overflow vulnerability in the `rxrpc_preparse_xdr_yfs_rxgk()` function. This flaw occurs when processing specially crafted key and ticket lengths, causing an incorrect memory allocation size. Consequently, a heap buffer overflow can occur, potentially leading to arbitrary code execution or a denial of service.
7.3 (High)
Affected products
Fixed
6 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debugsource-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in the Linux kernel's IPv6 ICMP error generation. A remote attacker could send a specially crafted IPv4 ICMP error packet with a Common Internet Protocol Security Option (CIPSO) IP option. This could lead to incorrect handling of packet control block data when generating an IPv6 ICMP error, potentially causing an out-of-bounds memory access. This memory corruption could result in information disclosure or a denial of service.
7.3 (High)
Affected products
Fixed
6 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debugsource-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in the Netfilter flowtable component of the Linux kernel. This vulnerability occurs because the system does not strictly check the maximum number of hardware offload actions for IPv6, allowing it to process more actions than supported. This could potentially lead to system instability or a denial of service (DoS) condition, where the affected system becomes unresponsive.
7.8 (High)
Affected products
Fixed
6 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debugsource-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in the Linux kernel's netfilter subsystem, specifically within the nft_inner module. This vulnerability arises from an incorrect handling of IPv6 inner packet processing, where the transport header offset (inner_thoff) becomes desynchronized from the Layer 4 protocol (l4proto). A remote attacker could exploit this desynchronization to perform transport header forgery, potentially leading to a firewall bypass and allowing unauthorized network access.
7.3 (High)
Affected products
Fixed
6 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debugsource-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in the Linux kernel's traffic control (TC) classifier application programming interface (API). The `tcf_qevent_handle` function does not properly handle a consumed socket buffer (`skb`) when it is processed by the defragmentation engine. This can lead to a Use-After-Free (UAF) vulnerability, where the system attempts to use memory that has already been freed. An attacker could potentially exploit this to cause system instability or execute arbitrary code.
7.8 (High)
Affected products
Fixed
6 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debugsource-0:1-6.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
33 references
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"vulnerabilities": [
{
"cve": "CVE-2026-31641",
"cwe": {
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"name": "Integer Overflow or Wraparound"
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"discovery_date": "2026-04-24T00:00:00+00:00",
"ids": [
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{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s rxrpc subsystem. An unprivileged local user could exploit an integer overflow vulnerability in the `rxrpc_preparse_xdr_yfs_rxgk()` function. This flaw occurs when processing specially crafted key and ticket lengths, causing an incorrect memory allocation size. Consequently, a heap buffer overflow can occur, potentially leading to arbitrary code execution or a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: rxrpc: Fix RxGK token loading to check bounds",
"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": "other",
"text": "This Important flaw in the Linux kernel\u0027s networking scheduler can lead to a use-after-free vulnerability. Exploitation requires a local attacker to configure specific `tc qdisc` and `tc filter` rules involving RED qdisc with early drop events and connection tracking on fragmented network traffic. This non-default configuration limits the attack surface, but successful exploitation could lead to privilege escalation or a denial of service.",
"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": {
"fixed": [
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.ppc64le",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.src",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.x86_64",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.ppc64le",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.x86_64",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debugsource-0:1-6.el10_2.ppc64le"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-64530"
},
{
"category": "external",
"summary": "RHBZ#2504052",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2504052"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-64530",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64530"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-64530",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64530"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026072624-CVE-2026-64530-52e9@gregkh/T/#u",
"url": "https://lore.kernel.org/linux-cve-announce/2026072624-CVE-2026-64530-52e9@gregkh/T/#u"
}
],
"release_date": "2026-06-23T23:59:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-17T14:25:46+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",
"product_ids": [
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.ppc64le",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.src",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.x86_64",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.ppc64le",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.x86_64",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debugsource-0:1-6.el10_2.ppc64le"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:55618"
},
{
"category": "workaround",
"details": "To mitigate this issue, avoid configuring the Linux kernel\u0027s traffic control (tc) subsystem with the RED queue discipline (`red`) that includes `qevent early_drop` and an `action ct` filter on interfaces processing fragmented UDP streams. This specific configuration is required to trigger the use-after-free vulnerability.",
"product_ids": [
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.ppc64le",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.src",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.x86_64",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.ppc64le",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.x86_64",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debugsource-0:1-6.el10_2.ppc64le"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.ppc64le",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.src",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.x86_64",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.ppc64le",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.x86_64",
"BaseOS-10.2.Z:kpatch-patch-6_12_0-211_16_1-debugsource-0:1-6.el10_2.ppc64le"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle"
}
]
}
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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.
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.
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