CVE-2026-53063 addresses a flaw in the Linux kernel's dm cache component where the invalidate_remove() function mishandles write hit bios after cache invalidation. Specifically, it sets up remapping for overwrite_bio but drops it without submission, causing write operations to hang. The fix introduces an invalidate_committed() continuation to submit remapped writes after metadata commits and uses an overwrite_endio hook to maintain proper completion sequencing and coherency. Additionally, error handling in invalidate_complete() was improved to retain the original error status instead of unconditionally using bio_io_error().

This vulnerability results in write operations hanging, causing denial of service conditions on affected systems. There is no impact on confidentiality or integrity, only availability is affected.

A fix is available that corrects the write hang issue by properly submitting remapped writes and improving error handling. Users should apply the official Linux kernel patch that addresses this flaw. Patch status is not explicitly confirmed in the provided data; therefore, check the vendor advisory for current remediation guidance.