CVE-2026-53266VulnerabilityPublished 28 Oct 2026

Red Hat Security Advisory: kpatch-patch-6_12_0-211_16_1 and kpatch-patch-6_12_0-211_49_1 security update

Affects Red HatSource GCVE Database

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Mentioned vulnerabilities

Not known to be exploited.

Data as of 29 Oct 2026, 08:29 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

Red Hat has released official live patch updates (kpatch-patch-6_12_0-211_16_1 and kpatch-patch-6_12_0-211_49_1) that address these vulnerabilities for Red Hat Enterprise Linux 10. Users should apply these live patches following Red Hat's guidance to remediate the issues. Detailed instructions are available in Red Hat's advisory and knowledge base article (https://access.redhat.com/articles/11258). No additional mitigation steps are indicated beyond applying the provided patches.

Description

Red Hat has released a security update for the kpatch live kernel patch module targeting kernel version 6.12.0-211.16.1.el10_2. This update addresses multiple vulnerabilities in the Linux kernel, including issues in netfilter ebtables, pppoe header handling, network bridge fast-leave behavior, packet hard header length consistency, and xfrm ah6 routing header validation. The update is rated as Important by Red Hat Product Security.

Impact

The vulnerabilities fixed by this update affect kernel components responsible for network packet processing and routing. Exploitation could lead to memory corruption or inconsistent network behavior, potentially impacting system stability or security. Red Hat rates the overall security impact of this update as Important, indicating a high severity level but no confirmed exploitation in the wild.

Summary

This security advisory from Red Hat addresses several vulnerabilities in the Linux kernel that can be mitigated by applying live patches via the kpatch utility. The fixed issues include: CVE-2026-53266, where the netfilter ebtables SNAT target improperly writes to shared memory pages during ARP hardware address rewriting; CVE-2026-68121, involving improper reloading of the header pointer after dev_hard_header() in pppoe; CVE-2026-74480, which concerns stopping fast-leave after deleting a port group in the network bridge; CVE-2026-74582, ensuring consistent hard_header_len in non-ring send paths in packet handling; and CVE-2026-80844, which validates the segments_left field in the xfrm ah6 routing header. These fixes are delivered as kpatch live patch modules for Red Hat Enterprise Linux 10 on x86_64 and ppc64le architectures.

CWE-825Expired Pointer Dereference (opens in a new tab)
Base weakness
The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.
Architecture and Design
Choose a language that provides automatic memory management.
Implementation
When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-805Buffer Access with Incorrect Length Value (opens in a new tab)
Base weaknessLikelihood of exploit: High
The product uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer.
Requirements · Language Selection
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Operation · Build and Compilation · Environment Hardening
Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index…
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Overflow Buffers (opens in a new tab)
SOAP Array Overflow (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 29 Oct 2026, 08:29 UTC

Public exploits and detectionGitHub proofs of concept

WeaknessesCWE-825, CWE-805

Technical details

References

Community reviews

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