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CVE-2026-64253

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: kernel/fork: clear PF_BLOCK_TS in copy_process() PF_BLOCK_TS is only set in blk_time_get_ns() when current->plug is non-NULL, a…

Published Jul 24, 2026CWE-476EPSS 0.11%

Overview

CVE-2026-64253 is a medium-severity vulnerability. It was published on July 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

kernel/fork: clear PF_BLOCK_TS in copy_process()

PF_BLOCK_TS is only set in blk_time_get_ns() when current->plug is

non-NULL, and blk_finish_plug() clears it via __blk_flush_plug()

before NULLing the plug pointer. copy_process() breaks the

invariant by inheriting PF_BLOCK_TS from the parent while resetting

the child's plug to NULL.

Clear PF_BLOCK_TS alongside that assignment so callers can rely on

"PF_BLOCK_TS set implies current->plug != NULL" and dereference

current->plug unguarded.

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/77bba61a20f1b3d206f4f90e10a7bb3cd90b9619Refgit.kernel.org/stable/c/99e6c712cc300883b8cbf03347d5359ec1a4d6ddRefgit.kernel.org/stable/c/ee0801aceabdf583392477baf69a290b09448b8fRefgit.kernel.org/stable/c/fd38b75c4b43295b10d69772a46d1c74dbd6fc81

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64253?

CVE-2026-64253 is a medium-severity vulnerability. It was published on July 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-64253?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-64253?

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-2026-64253?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64253 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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