{"id":"CVE-2026-90401","title":"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","summary":"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 som…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= f51d46d0e7cb5b8494aa534d276a9d8915a2443d < 9bb9504e2d8f3d22ef12d51c333dd499f402dc8f","Linux >= f51d46d0e7cb5b8494aa534d276a9d8915a2443d < 3fe5b7c9fb72ccc29bfd0f955b124892af7e3674","Linux 39db562b3fedb93978a7e42dd216b306740959f8","Linux >= 5.15.111 < 5.16","Linux 5.17"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:57.360","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90401","references":[{"url":"https://git.kernel.org/stable/c/3fe5b7c9fb72ccc29bfd0f955b124892af7e3674","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9bb9504e2d8f3d22ef12d51c333dd499f402dc8f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.0011,"epssPercentile":0.01468,"ingestedAt":"2026-09-17T16:21:47.800Z","slug":"CVE-2026-90401","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":207301,"id":"CVE-2026-90401","ts":1789757340589,"field":"cvss","old":null,"new":"7.1"},{"seq":207300,"id":"CVE-2026-90401","ts":1789757340589,"field":"severity","old":"none","new":"high"}]}