CVE-2026-64253kernel/fork: clear PF_BLOCK_TS in copy_process()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 06b23f92af87a84d70881b2ecaa72e00f7838264 before ee0801aceabdf583392477baf69a290b09448b8f; from 06b23f92af87a84d70881b2ecaa72e00f7838264 before 99e6c712cc300883b8cbf03347d5359ec1a4d6dd; from 06b23f92af87a84d70881b2ecaa72e00f7838264 before 77bba61a20f1b3d206f4f90e10a7bb3cd90b9619; from 06b23f92af87a84d70881b2ecaa72e00f7838264 before fd38b75c4b43295b10d69772a46d1c74dbd6fc81 | CNA record |
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/ee0801aceabdf583392477baf69a290b09448b8fpatch
- https://git.kernel.org/stable/c/99e6c712cc300883b8cbf03347d5359ec1a4d6ddpatch
- https://git.kernel.org/stable/c/77bba61a20f1b3d206f4f90e10a7bb3cd90b9619patch
- 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.