CVE-2026-90401md: remove REQ_NOWAIT support from raid1/10/456
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: md: remove REQ_NOWAIT support from raid1/10/456 REQ_NOWAIT support in md personalities that can block internally is fundamentally incomplete. While reads can avoid some blocking paths, write requests can still encounter cases where one mirror succeeds while another returns -EAGAIN. At that point md cannot distinguish queue pressure from a real device failure, so it can neither record a bad block nor safely retry the write without REQ_NOWAIT, leaving mirrors with divergent data. Rather than continue advertising REQ_NOWAIT support for personalities that cannot implement it correctly, remove it from raid1, raid10 and raid456. Keep REQ_NOWAIT for linear and raid0, which only remap bios to their underlying devices; stacked limits will still clear the feature if any component device lacks REQ_NOWAIT support.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f51d46d0e7cb5b8494aa534d276a9d8915a2443d before ffcc9ea4e4d121c78aef6654a1577aa7d120774d; from f51d46d0e7cb5b8494aa534d276a9d8915a2443d before 9bb9504e2d8f3d22ef12d51c333dd499f402dc8f; from f51d46d0e7cb5b8494aa534d276a9d8915a2443d before 3fe5b7c9fb72ccc29bfd0f955b124892af7e3674; 39db562b3fedb93978a7e42dd216b306740959f8; from 5.15.111 before 5.16 | CNA record |
References
- https://git.kernel.org/stable/c/ffcc9ea4e4d121c78aef6654a1577aa7d120774d
- https://git.kernel.org/stable/c/9bb9504e2d8f3d22ef12d51c333dd499f402dc8f
- https://git.kernel.org/stable/c/3fe5b7c9fb72ccc29bfd0f955b124892af7e3674
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.