Executive Summary

This vulnerability exists in the Linux kernel's device mapper cache (dm cache) subsystem, specifically in passthrough mode. The issue is caused by incomplete logic in the invalidate_remove() function when handling write hit bios after cache invalidation. The function sets up remapping for the overwrite_bio but then drops it immediately without submitting it, which causes write operations to hang.

The fix involves adding a new continuation function, invalidate_committed(), which submits the remapped writes to the cache origin after the metadata commit completes. It also uses the overwrite_endio hook to ensure proper completion sequencing and improves error handling to preserve the original error status.

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Impact Analysis

This vulnerability can cause write operations to hang in the Linux kernel's dm cache passthrough mode. This means that data writes may not complete properly, potentially leading to system instability, degraded performance, or data loss if write operations are indefinitely stalled.

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