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CVE-2026-74262

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: kcm: use WRITE_ONCE() when changing lower socket callbacks kcm_attach() replaces a live lower TCP socket's sk_data_ready and sk…

Published Aug 15, 2026EPSS 0.18%

Overview

CVE-2026-74262 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

kcm: use WRITE_ONCE() when changing lower socket callbacks

kcm_attach() replaces a live lower TCP socket's sk_data_ready and

sk_write_space callbacks with KCM handlers, and kcm_unattach() restores

them later. Those callback-pointer updates are still plain stores even

though the same fields can be read and invoked concurrently on other

CPUs.

If another CPU observes an older callback snapshot after the live field

has already been restored, callback execution can run with a mismatched

target and sk_user_data state, leading to stale or misdirected wakeups.

Use WRITE_ONCE() for the callback replacement and restore operations so

these shared callback fields follow the same visibility contract already

established by the earlier 4022 fixes.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0cb3e2f40679032c1aa2186280a86e5ead0161eeRefgit.kernel.org/stable/c/11faefd11ce2448bac7279ab302dd1954a6547feRefgit.kernel.org/stable/c/47186409c092cd7dd70350999186c700233e854dRefgit.kernel.org/stable/c/9684fff87124b201e11dea01ded9173025359a0fRefgit.kernel.org/stable/c/b4ccd6eef671d7c44a30123cd29f3acf3de8468eRefgit.kernel.org/stable/c/b8c90823cdfb5f3d22f261aeb3e9066612853c36Refgit.kernel.org/stable/c/f01fb6138f8eb606b56ce9158e2d8b72352c53f4Refgit.kernel.org/stable/c/fa26e4606aed0f7fe793c325506adeda1d847a43

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74262?

CVE-2026-74262 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-74262?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-74262?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-74262?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74262 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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