CVE-2026-64253

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux06b23f92af87a84d70881b2ecaa72e00f7838264 < ee0801aceabdf583392477baf69a290b09448b8faffected
LinuxLinux06b23f92af87a84d70881b2ecaa72e00f7838264 < 99e6c712cc300883b8cbf03347d5359ec1a4d6ddaffected
LinuxLinux06b23f92af87a84d70881b2ecaa72e00f7838264 < 77bba61a20f1b3d206f4f90e10a7bb3cd90b9619affected
LinuxLinux06b23f92af87a84d70881b2ecaa72e00f7838264 < fd38b75c4b43295b10d69772a46d1c74dbd6fc81affected
LinuxLinux6.9affected
LinuxLinux0 < 6.9unaffected
LinuxLinux6.12.95 <= 6.12.*unaffected
LinuxLinux6.18.38 <= 6.18.*unaffected
LinuxLinux7.1.3 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References