CVE-2025-22125

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux5404bc7a87b9949cf61e0174b21f80e73239ab25 < 10f4ff4baeb6951cf58282954318827b6852d501affected
LinuxLinux5404bc7a87b9949cf61e0174b21f80e73239ab25 < 73506e581c0b1814cdfd2229d589f30751d7de26affected
LinuxLinux5404bc7a87b9949cf61e0174b21f80e73239ab25 < 8a0adf3d778c4a0893c6d34a9e1b0082a6f1c495affected
LinuxLinux5404bc7a87b9949cf61e0174b21f80e73239ab25 < e879a0d9cb086c8e52ce6c04e5bfa63825a6213caffected
LinuxLinux2.6.19affected
LinuxLinux0 < 2.6.19unaffected
LinuxLinux6.6.136 <= 6.6.*unaffected
LinuxLinux6.12.46 <= 6.12.*unaffected
LinuxLinux6.14.2 <= 6.14.*unaffected
LinuxLinux6.15 <= *unaffected

Weaknesses

References