CVE-2026-53063: In the Linux kernel, the following vulnerability has been resolved: dm cache: fix write hang in passthrough mode The i
Summary
A bug in the Linux kernel's dm cache (device mapper cache, a storage layer that speeds up disk access) caused write operations to hang when the cache was in passthrough mode (a mode where the cache temporarily stops caching data). The problem occurred because the invalidate_remove() function wasn't properly handling write requests after cache data was cleared, causing these requests to be dropped instead of completed.
Solution / Mitigation
The fix adds a new invalidate_committed() continuation function that submits remapped writes to the cache origin after metadata commit completes, while using the overwrite_endio hook to ensure proper completion sequencing. Additionally, error handling in invalidate_complete() was improved to preserve the original error status instead of unconditionally using bio_io_error().
Vulnerability Details
EPSS: 0.0%
June 24, 2026
Classification
Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-53063
First tracked: June 25, 2026 at 08:22 AM
Classified by LLM (prompt v3) · confidence: 95%