{"id":"CVE-2026-64425","summary":"io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item","details":"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.","modified":"2026-07-27T04:03:20.106662630Z","published":"2026-07-25T08:51:03.036Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64425.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/14b7ecad2ec56699325180a744f4b19f046401bb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1636d85dc139b07c0449308f2bb5e0c7a2e0da99"},{"type":"WEB","url":"https://git.kernel.org/stable/c/29bef9934b2521f787bb15dd1985d4c0d12ae02a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e2f51f3e06773c2ee98ad09738f0908b48f76f9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ab85765cbe3258b43dc6729af0e6ce3a87a133d8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b6f179a653a934736c88d820fe0098c3c2532549"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d179533c610e1b4c6aa436e3c1fd1b719d2c727c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ea61b04e1d7242cb37f5ed2cc91cf21a493f6597"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64425.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64425"},{"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":"065dd936195a3466b8ebe5f9287400987ee3c063"},{"fixed":"14b7ecad2ec56699325180a744f4b19f046401bb"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"27e47500fac23d15b7dc93ff650bc4844d2581bd"},{"fixed":"d179533c610e1b4c6aa436e3c1fd1b719d2c727c"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d05d99573f81a091547b1778b9a50120f5d6c68a"},{"fixed":"6e2f51f3e06773c2ee98ad09738f0908b48f76f9"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"85eb83694a91c89d9abe615d717c0053c3efa714"},{"fixed":"ea61b04e1d7242cb37f5ed2cc91cf21a493f6597"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2e8ca1078b14142db2ce51cbd18ff9971560046b"},{"fixed":"b6f179a653a934736c88d820fe0098c3c2532549"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bdf0bf73006ea8af9327cdb85cfdff4c23a5f966"},{"fixed":"1636d85dc139b07c0449308f2bb5e0c7a2e0da99"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"10dc959398175736e495f71c771f8641e1ca1907"},{"fixed":"ab85765cbe3258b43dc6729af0e6ce3a87a133d8"},{"fixed":"29bef9934b2521f787bb15dd1985d4c0d12ae02a"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.253"},{"fixed":"5.10.261"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.203"},{"fixed":"5.15.212"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.167"},{"fixed":"6.1.178"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.122"},{"fixed":"6.6.145"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.68"},{"fixed":"6.12.96"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.18.8"},{"fixed":"6.18.39"}]}],"versions":["v5.10.260","v5.10.259","v5.10.258","v5.10.257","v5.10.256","v5.10.255","v5.10.254","v5.10.253","v5.15.211","v5.15.210","v5.15.209","v5.15.208","v5.15.207","v5.15.206","v5.15.205","v5.15.204","v5.15.203","v6.1.177","v6.1.176","v6.1.175","v6.1.174","v6.1.173","v6.1.172","v6.1.171","v6.1.170","v6.1.169","v6.1.168","v6.1.167","v6.6.144","v6.6.143","v6.6.142","v6.6.141","v6.6.140","v6.6.139","v6.6.138","v6.6.137","v6.6.136","v6.6.135","v6.6.134","v6.6.133","v6.6.132","v6.6.131","v6.6.130","v6.6.129","v6.6.128","v6.6.127","v6.6.126","v6.6.125","v6.6.124","v6.6.123","v6.6.122","v6.12.95","v6.12.94","v6.12.93","v6.12.92","v6.12.91","v6.12.90","v6.12.89","v6.12.88","v6.12.87","v6.12.86","v6.12.85","v6.12.84","v6.12.83","v6.12.82","v6.12.81","v6.12.80","v6.12.79","v6.12.78","v6.12.77","v6.12.76","v6.12.75","v6.12.74","v6.12.73","v6.12.72","v6.12.71","v6.12.70","v6.12.69","v6.12.68","v6.18.38","v6.18.37","v6.18.36","v6.18.35","v6.18.34","v6.18.33","v6.18.32","v6.18.31","v6.18.30","v6.18.29","v6.18.28","v6.18.27","v6.18.26","v6.18.25","v6.18.24","v6.18.23","v6.18.22","v6.18.21","v6.18.20","v6.18.19","v6.18.18","v6.18.17","v6.18.16","v6.18.15","v6.18.14","v6.18.13","v6.18.12","v6.18.11","v6.18.10","v6.18.9","v6.18.8"],"database_specific":{"sour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