{"id":"CVE-2026-64425","title":"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 c…","summary":"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 c…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.10.253, < 5.10.261","linux_kernel >= 5.15.203, < 5.15.212","linux_kernel >= 6.1.167, < 6.1.178","linux_kernel >= 6.6.122, < 6.6.145","linux_kernel >= 6.12.68, < 6.12.96","linux_kernel >= 6.18.8, < 6.18.39","linux_kernel >= 6.19.1, < 7.1.4","linux_kernel = 6.19"],"patched":["linux_kernel 7.1.4"],"published":"2026-07-25","updated":"2026-09-08","sourceUpdated":"2026-09-08T09:18:19.647","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64425","references":[{"url":"https://git.kernel.org/stable/c/14b7ecad2ec56699325180a744f4b19f046401bb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1636d85dc139b07c0449308f2bb5e0c7a2e0da99","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/29bef9934b2521f787bb15dd1985d4c0d12ae02a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6e2f51f3e06773c2ee98ad09738f0908b48f76f9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ab85765cbe3258b43dc6729af0e6ce3a87a133d8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b6f179a653a934736c88d820fe0098c3c2532549","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d179533c610e1b4c6aa436e3c1fd1b719d2c727c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ea61b04e1d7242cb37f5ed2cc91cf21a493f6597","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00125,"epssPercentile":0.02568,"ingestedAt":"2026-09-08T15:33:26.949Z","slug":"CVE-2026-64425","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `linux_kernel >= 5.10.253, < 5.10.261`\n- `linux_kernel >= 5.15.203, < 5.15.212`\n- `linux_kernel >= 6.1.167, < 6.1.178`\n- `linux_kernel >= 6.6.122, < 6.6.145`\n- `linux_kernel >= 6.12.68, < 6.12.96`\n- `linux_kernel >= 6.18.8, < 6.18.39`\n- `linux_kernel >= 6.19.1, < 7.1.4`\n- `linux_kernel = 6.19`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.1.4`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}