{"api_version":"1","generated_at":"2026-07-25T05:40:26+00:00","cve":"CVE-2026-64253","urls":{"html":"https://cve.report/CVE-2026-64253","api":"https://cve.report/api/cve/CVE-2026-64253.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64253","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64253"},"summary":{"title":"kernel/fork: clear PF_BLOCK_TS in copy_process()","description":"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->plug 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->plug != NULL\" and dereference\ncurrent->plug unguarded.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-24 16:16:55","updated_at":"2026-07-24 16:16:55"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/77bba61a20f1b3d206f4f90e10a7bb3cd90b9619","name":"https://git.kernel.org/stable/c/77bba61a20f1b3d206f4f90e10a7bb3cd90b9619","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/99e6c712cc300883b8cbf03347d5359ec1a4d6dd","name":"https://git.kernel.org/stable/c/99e6c712cc300883b8cbf03347d5359ec1a4d6dd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fd38b75c4b43295b10d69772a46d1c74dbd6fc81","name":"https://git.kernel.org/stable/c/fd38b75c4b43295b10d69772a46d1c74dbd6fc81","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ee0801aceabdf583392477baf69a290b09448b8f","name":"https://git.kernel.org/stable/c/ee0801aceabdf583392477baf69a290b09448b8f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64253","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64253","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 06b23f92af87a84d70881b2ecaa72e00f7838264 ee0801aceabdf583392477baf69a290b09448b8f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 06b23f92af87a84d70881b2ecaa72e00f7838264 99e6c712cc300883b8cbf03347d5359ec1a4d6dd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 06b23f92af87a84d70881b2ecaa72e00f7838264 77bba61a20f1b3d206f4f90e10a7bb3cd90b9619 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 06b23f92af87a84d70881b2ecaa72e00f7838264 fd38b75c4b43295b10d69772a46d1c74dbd6fc81 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.95 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.38 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.3 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/fork.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ee0801aceabdf583392477baf69a290b09448b8f","status":"affected","version":"06b23f92af87a84d70881b2ecaa72e00f7838264","versionType":"git"},{"lessThan":"99e6c712cc300883b8cbf03347d5359ec1a4d6dd","status":"affected","version":"06b23f92af87a84d70881b2ecaa72e00f7838264","versionType":"git"},{"lessThan":"77bba61a20f1b3d206f4f90e10a7bb3cd90b9619","status":"affected","version":"06b23f92af87a84d70881b2ecaa72e00f7838264","versionType":"git"},{"lessThan":"fd38b75c4b43295b10d69772a46d1c74dbd6fc81","status":"affected","version":"06b23f92af87a84d70881b2ecaa72e00f7838264","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/fork.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.95","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.38","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.3","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.95","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.38","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.3","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"6.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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->plug 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->plug != NULL\" and dereference\ncurrent->plug unguarded."}],"providerMetadata":{"dateUpdated":"2026-07-24T15:31:21.378Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ee0801aceabdf583392477baf69a290b09448b8f"},{"url":"https://git.kernel.org/stable/c/99e6c712cc300883b8cbf03347d5359ec1a4d6dd"},{"url":"https://git.kernel.org/stable/c/77bba61a20f1b3d206f4f90e10a7bb3cd90b9619"},{"url":"https://git.kernel.org/stable/c/fd38b75c4b43295b10d69772a46d1c74dbd6fc81"}],"title":"kernel/fork: clear PF_BLOCK_TS in copy_process()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64253","datePublished":"2026-07-24T15:31:21.378Z","dateReserved":"2026-07-19T15:36:31.773Z","dateUpdated":"2026-07-24T15:31:21.378Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-24 16:16:55","lastModifiedDate":"2026-07-24 16:16:55","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64253","Ordinal":"1","Title":"kernel/fork: clear PF_BLOCK_TS in copy_process()","CVE":"CVE-2026-64253","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64253","Ordinal":"1","NoteData":"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->plug 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->plug != NULL\" and dereference\ncurrent->plug unguarded.","Type":"Description","Title":"kernel/fork: clear PF_BLOCK_TS in copy_process()"}]}}}