{"id":"CVE-2026-64253","summary":"kernel/fork: clear PF_BLOCK_TS in copy_process()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nkernel/fork: clear PF_BLOCK_TS in copy_process()\n\nPF_BLOCK_TS is only set in blk_time_get_ns() when current-\u003eplug is\nnon-NULL, and blk_finish_plug() clears it via __blk_flush_plug()\nbefore NULLing the plug pointer.  copy_process() breaks the\ninvariant by inheriting PF_BLOCK_TS from the parent while resetting\nthe child's plug to NULL.\n\nClear PF_BLOCK_TS alongside that assignment so callers can rely on\n\"PF_BLOCK_TS set implies current-\u003eplug != NULL\" and dereference\ncurrent-\u003eplug unguarded.","modified":"2026-07-27T04:03:19.294641390Z","published":"2026-07-24T15:31:21.378Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64253.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/77bba61a20f1b3d206f4f90e10a7bb3cd90b9619"},{"type":"WEB","url":"https://git.kernel.org/stable/c/99e6c712cc300883b8cbf03347d5359ec1a4d6dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ee0801aceabdf583392477baf69a290b09448b8f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fd38b75c4b43295b10d69772a46d1c74dbd6fc81"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64253.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64253"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"06b23f92af87a84d70881b2ecaa72e00f7838264"},{"fixed":"ee0801aceabdf583392477baf69a290b09448b8f"},{"fixed":"99e6c712cc300883b8cbf03347d5359ec1a4d6dd"},{"fixed":"77bba61a20f1b3d206f4f90e10a7bb3cd90b9619"},{"fixed":"fd38b75c4b43295b10d69772a46d1c74dbd6fc81"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64253.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.9.0"},{"fixed":"6.12.95"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.38"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64253.json"}}],"schema_version":"1.7.5"}