CVE-2026-53063 dm cache: fix write hang in passthrough mode
A logic error in the Linux kernel's dm cache passthrough mode causes write operations to hang, leading to a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53063?
CVE-2026-53063 is a medium-severity denial of service vulnerability in Linux kernel, published on 24 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
dm cache: fix write hang in passthrough mode
The invalidate_remove() function has incomplete logic for handling write hit bios after cache invalidation. It sets up the remapping for the overwrite_bio but then drops it immediately without submission, causing write operations to hang.
Fix by adding a new invalidate_committed() continuation that submits the remapped writes to the cache origin after metadata commit completes, while using the overwrite_endio hook to ensure proper completion sequencing. This maintains existing coherency. Also improve error handling in invalidate_complete() to preserve the original error status instead of using bio_io_error() unconditionally.
Which versions are affected by CVE-2026-53063?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53063?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-53063 being exploited?
There is no known exploitation of CVE-2026-53063 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-53063, DEBIAN-CVE-2026-53063, GHSA-x22q-3h7c-4hgh, ROOT-OS-DEBIAN-11-CVE-2026-53063, ROOT-OS-DEBIAN-12-CVE-2026-53063, ROOT-OS-UBUNTU-2204-CVE-2026-53063 and 2 more.