{"id":"CVE-2026-64425","state":"PUBLISHED","title":"io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item\n\ncommit 10dc95939817 (\"io_uring/io-wq: check IO_WQ_BIT_EXIT inside work\nrun loop\") fixed the obvious case where io_worker_handle_work() took one\nexit-bit snapshot before draining pending work, but the fix stops one\nlevel too early.\n\nio_worker_handle_work() now re-checks IO_WQ_BIT_EXIT in its outer work\nrun loop, yet it still snapshots that bit once before processing a whole\ndependent linked-work chain. If io_wq_exit_start() sets IO_WQ_BIT_EXIT\nafter the first linked item has started, the remaining linked items can\nstill reuse stale do_kill = false, skip IO_WQ_WORK_CANCEL, and continue\nrunning after exit has begun.\n\nMove the check further inside, so it covers linked items too. Note: this\nis a syzbot special as it loves setting up tons of slow linked work on\nweird devices like msr that take forever to read, and immediately close\nthe ring. Exit then takes a long time.","publishedAt":"2026-07-25T08:51:03.036Z","updatedAt":"2026-10-15T01:23:50.155Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"065dd936195a3466b8ebe5f9287400987ee3c063","status":"affected","lessThan":"14b7ecad2ec56699325180a744f4b19f046401bb","versionType":"git"},{"version":"27e47500fac23d15b7dc93ff650bc4844d2581bd","status":"affected","lessThan":"d179533c610e1b4c6aa436e3c1fd1b719d2c727c","versionType":"git"},{"version":"d05d99573f81a091547b1778b9a50120f5d6c68a","status":"affected","lessThan":"6e2f51f3e06773c2ee98ad09738f0908b48f76f9","versionType":"git"},{"version":"85eb83694a91c89d9abe615d717c0053c3efa714","status":"affected","lessThan":"ea61b04e1d7242cb37f5ed2cc91cf21a493f6597","versionType":"git"},{"version":"2e8ca1078b14142db2ce51cbd18ff9971560046b","status":"affected","lessThan":"b6f179a653a934736c88d820fe0098c3c2532549","versionType":"git"},{"version":"bdf0bf73006ea8af9327cdb85cfdff4c23a5f966","status":"affected","lessThan":"1636d85dc139b07c0449308f2bb5e0c7a2e0da99","versionType":"git"},{"version":"10dc959398175736e495f71c771f8641e1ca1907","status":"affected","lessThan":"ab85765cbe3258b43dc6729af0e6ce3a87a133d8","versionType":"git"},{"version":"10dc959398175736e495f71c771f8641e1ca1907","status":"affected","lessThan":"29bef9934b2521f787bb15dd1985d4c0d12ae02a","versionType":"git"},{"version":"5.10.253","status":"affected","lessThan":"5.10.261","versionType":"semver"},{"version":"5.15.203","status":"affected","lessThan":"5.15.212","versionType":"semver"},{"version":"6.1.167","status":"affected","lessThan":"6.1.178","versionType":"semver"},{"version":"6.6.122","status":"affected","lessThan":"6.6.145","versionType":"semver"},{"version":"6.12.68","status":"affected","lessThan":"6.12.96","versionType":"semver"},{"version":"6.18.8","status":"affected","lessThan":"6.18.39","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["io_uring/io-wq.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["io_uring/io-wq.c"]}],"references":["https://git.kernel.org/stable/c/14b7ecad2ec56699325180a744f4b19f046401bb","https://git.kernel.org/stable/c/d179533c610e1b4c6aa436e3c1fd1b719d2c727c","https://git.kernel.org/stable/c/6e2f51f3e06773c2ee98ad09738f0908b48f76f9","https://git.kernel.org/stable/c/ea61b04e1d7242cb37f5ed2cc91cf21a493f6597","https://git.kernel.org/stable/c/b6f179a653a934736c88d820fe0098c3c2532549","https://git.kernel.org/stable/c/1636d85dc139b07c0449308f2bb5e0c7a2e0da99","https://git.kernel.org/stable/c/ab85765cbe3258b43dc6729af0e6ce3a87a133d8","https://git.kernel.org/stable/c/29bef9934b2521f787bb15dd1985d4c0d12ae02a","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64425.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64425","state":"PUBLISHED","datePublished":"2026-07-25T08:51:03.036Z","dateUpdated":"2026-10-15T01:23:50.155Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.787Z"},"containers":{"cna":{"title":"io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item\n\ncommit 10dc95939817 (\"io_uring/io-wq: check IO_WQ_BIT_EXIT inside work\nrun loop\") fixed the obvious case where io_worker_handle_work() took one\nexit-bit snapshot before draining pending work, but the fix stops one\nlevel too early.\n\nio_worker_handle_work() now re-checks IO_WQ_BIT_EXIT in its outer work\nrun loop, yet it still snapshots that bit once before processing a whole\ndependent linked-work chain. If io_wq_exit_start() sets IO_WQ_BIT_EXIT\nafter the first linked item has started, the remaining linked items can\nstill reuse stale do_kill = false, skip IO_WQ_WORK_CANCEL, and continue\nrunning after exit has begun.\n\nMove the check further inside, so it covers linked items too. Note: this\nis a syzbot special as it loves setting up tons of slow linked work on\nweird devices like msr that take forever to read, and immediately close\nthe ring. Exit then takes a long 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