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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | No solution exists | Oct 22, 2026 | Sep 17, 2026 |
| Ubuntu | — | Upgrade linux-oem-7.0Upgrade linux-riscv-7.0Upgrade linux-hwe-7.0Upgrade linux-awsUpgrade linuxUpgrade linux-oracleUpgrade linux-gcpUpgrade linux-riscvUpgrade linux-ibm | Nov 3, 2026 | Sep 17, 2026 |
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