CVE-2026-64253kernel/fork: clear PF_BLOCK_TS in copy_process()
- 5.5MediumCVSS base score
- 0.11%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.11% · top 98% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 06b23f92af87a84d70881b2ecaa72e00f7838264 – < ee0801aceabdf583392477baf69a290b09448b8f
- affected 06b23f92af87a84d70881b2ecaa72e00f7838264 – < 99e6c712cc300883b8cbf03347d5359ec1a4d6dd
- affected 06b23f92af87a84d70881b2ecaa72e00f7838264 – < 77bba61a20f1b3d206f4f90e10a7bb3cd90b9619
- affected 06b23f92af87a84d70881b2ecaa72e00f7838264 – < fd38b75c4b43295b10d69772a46d1c74dbd6fc81
- affected 6.9
- unaffected < 6.9
- unaffected 6.12.95 – ≤ 6.12.*
- unaffected 6.18.38 – ≤ 6.18.*
- unaffected 7.1.3 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References4
- https://git.kernel.org/stable/c/ee0801aceabdf583392477baf69a290b09448b8f (opens in a new tab)
- https://git.kernel.org/stable/c/99e6c712cc300883b8cbf03347d5359ec1a4d6dd (opens in a new tab)
- https://git.kernel.org/stable/c/77bba61a20f1b3d206f4f90e10a7bb3cd90b9619 (opens in a new tab)
- https://git.kernel.org/stable/c/fd38b75c4b43295b10d69772a46d1c74dbd6fc81 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48662 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64253)Record last updated .