CVE-2025-22125: md/raid1,raid10: don't ignore IO flags

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-04-16 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: md/raid1,raid10: don't ignore IO flags If blk-wbt is enabled by default, it's found that raid write performance is quite bad because all IO are throttled by wbt of underlying disks, due to flag REQ_IDLE is ignored. And turns out this behaviour exist since blk-wbt is introduced. Other than REQ_IDLE, other flags should not be ignored as well, for example REQ_META can be set for filesystems, clearing it can cause priority reverse problems; And REQ_NOWAIT should not be cleared as well, because io will wait instead of failing directly in underlying disks. Fix those problems by keep IO flags from master bio. Fises: f51d46d0e7cb ("md: add support for REQ_NOWAIT")

Affected products

Linux kernel: from 2.6.19 before 6.12.46; from 6.13 before 6.14.2 — fixed in 6.12.46, 6.14.2

How to fix

Upgrade to a fixed version: Linux kernel 6.12.46, 6.14.2. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2025-22125 or the next vulnerability affects your stack