{"id":"CVE-2026-90401","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-90401","summary":"md: remove REQ_NOWAIT support from raid1/10/456","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmd: remove REQ_NOWAIT support from raid1/10/456\n\nREQ_NOWAIT support in md personalities that can block internally is\nfundamentally incomplete. While reads can avoid some blocking paths,\nwrite requests can still encounter cases where one mirror succeeds while\nanother returns -EAGAIN. At that point md cannot distinguish queue\npressure from a real device failure, so it can neither record a bad\nblock nor safely retry the write without REQ_NOWAIT, leaving mirrors\nwith divergent data.\n\nRather than continue advertising REQ_NOWAIT support for personalities\nthat cannot implement it correctly, remove it from raid1, raid10 and\nraid456. Keep REQ_NOWAIT for linear and raid0, which only remap bios to\ntheir underlying devices; stacked limits will still clear the feature if\nany component device lacks REQ_NOWAIT support.","published":"2026-09-17T16:09:31.556Z","modified":"2026-09-20T11:30:54.832218247Z","cvss":{"score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"7.2.6"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3fe5b7c9fb72ccc29bfd0f955b124892af7e3674"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9bb9504e2d8f3d22ef12d51c333dd499f402dc8f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90401.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90401"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-20T11:30:54.832218247Z"}}