kernel/fork: clear PF_BLOCK_TS in copy_process()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64253
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-24 16:16:55 UTC
Updated2026-08-17 05:17:23 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.001570000 probability, percentile 0.053230000 (date 2026-08-03)

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 06b23f92af87a84d70881b2ecaa72e00f7838264 ee0801aceabdf583392477baf69a290b09448b8f git Not specified
CNA Linux Linux affected 06b23f92af87a84d70881b2ecaa72e00f7838264 99e6c712cc300883b8cbf03347d5359ec1a4d6dd git Not specified
CNA Linux Linux affected 06b23f92af87a84d70881b2ecaa72e00f7838264 77bba61a20f1b3d206f4f90e10a7bb3cd90b9619 git Not specified
CNA Linux Linux affected 06b23f92af87a84d70881b2ecaa72e00f7838264 fd38b75c4b43295b10d69772a46d1c74dbd6fc81 git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.38 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.3 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/77bba61a20f1b3d206f4f90e10a7bb3cd90b9619 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/99e6c712cc300883b8cbf03347d5359ec1a4d6dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fd38b75c4b43295b10d69772a46d1c74dbd6fc81 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ee0801aceabdf583392477baf69a290b09448b8f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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