Medium 5.5Published Jul 24, 2026

CVE-2026-64253In 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 b…

Updated under an hour ago (2026-10-19 07:00 UTC)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Aug 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

linux linux_kernel linux:linux_kernel	from 6.9 before 6.12.95; from 6.13 before 6.18.38; from 6.19 before 7.1.3	NVD

References

https://git.kernel.org/stable/c/77bba61a20f1b3d206f4f90e10a7bb3cd90b9619patch
https://git.kernel.org/stable/c/99e6c712cc300883b8cbf03347d5359ec1a4d6ddpatch
https://git.kernel.org/stable/c/ee0801aceabdf583392477baf69a290b09448b8fpatch
https://git.kernel.org/stable/c/fd38b75c4b43295b10d69772a46d1c74dbd6fc81patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.