CVE-2026-64253
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.
Affected versions
Linux kernel versions
6.9
and later are affected. Fixed in
6.12.95,
6.18.38,
7.1.3,
7.2-rc1
and their respective stable series.
References
4 totalFrequently asked questions
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What is CVE-2026-64253?
CVE-2026-64253 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.9 onward and has been patched in 6.12.95, 6.18.38, 7.1.3 and others. CVE-2026-64253 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-64253?
Yes. CVE-2026-64253 has been patched. Fixed versions include 6.12.95, 6.18.38, 7.1.3 and others. If you are running Linux kernel 6.9 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-64253 actively exploited?
No. CVE-2026-64253 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.