Linux Kernel Vulnerability in RAID10 Discard Handling

CVE-2025-40325

Summary

A flaw has been identified in the Linux kernel's RAID10 handling mechanism concerning discard requests. The affected function, raid10_handle_discard, fails to properly wait for a barrier before returning a discard bio tagged with the REQ_NOWAIT flag. This could lead to unforeseen consequences when executing discard operations. Additionally, the presence of unnecessary warning call traces in the dmesg logs might cause confusion among quality engineers, as they typically monitor this output for indications of errors. Addressing this issue enhances the reliability and predictability of discard handling within RAID10 configurations, allowing for improved system reliability.

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