CVE-2026-53264VulnerabilityPublished 17 Aug 2026Updated 29 Oct 2026

Red Hat Security Advisory: kernel security update

Affects Linux kernelSource GCVE Database

Compare

Not known to be exploited.

Data as of 29 Oct 2026, 10:37 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.4% chance of exploitation in 30 days – higher than 41% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
Public exploit code: GitHub proofs of concept
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), GitHub proofs of concept, 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 an official security update for the kernel packages in Red Hat Enterprise Linux 9.2 that addresses this vulnerability. Users should apply the update promptly and reboot their systems to activate the fix. Red Hat advises against delaying this update as it improves overall security posture. No additional mitigations are specified beyond applying the official patch and rebooting.

Description

A security update for the Linux kernel in Red Hat Enterprise Linux 9.2 addresses a vulnerability in the net/sched act_api component related to the use of RCU with deferred freeing for the action lifecycle (CVE-2026-53264). This update is rated as Important by Red Hat and requires a system reboot to take effect. The kernel is a critical component of the operating system, and Red Hat advises prompt application of this update to maintain system security.

Impact

The vulnerability affects the Linux kernel's network scheduling component, potentially impacting system stability or security. Red Hat rates the security impact as Important, indicating a significant risk if unpatched. No known exploits in the wild have been reported. Because the kernel is central to system operation, any flaw can have broad security implications.

Summary

The Red Hat kernel packages for Red Hat Enterprise Linux 9.2 contain a security fix for CVE-2026-53264, which involves the net/sched act_api subsystem. The fix implements the use of Read-Copy-Update (RCU) with deferred freeing for the action lifecycle to address a security issue. Red Hat classifies this update as Important and recommends treating all kernel errata as security-relevant due to the kernel's fundamental role in system security. The advisory emphasizes the importance of applying the update and rebooting the system to ensure the fix is active.

CWE-364Signal Handler Race Condition (opens in a new tab)
Base weaknessLikelihood of exploit: Medium
The product uses a signal handler that introduces a race condition.
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
Design signal handlers to only set flags, rather than perform complex functionality. These flags can then be checked and acted upon within the main program loop.
Implementation
Only use reentrant functions within signal handlers. Also, use validation to ensure that state is consistent while performing asynchronous actions that affect the state of execution.
OWASP Cheat Sheets
Abuse Case (opens in a new tab)
OWASP ASVS 4.0.3
V1.11.2 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 29 Oct 2026, 10:22 UTC

Public exploits and detectionGitHub proofs of concept

WeaknessesCWE-364

Technical details

References

Community reviews

Related threats