CVE-2026-23007 block: zero non-PI portion of auto integrity buffer
Uninitialized memory in the Linux kernel block layer integrity buffer may leak sensitive data to userspace or physical attackers.
- 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-2026-23007?
CVE-2026-23007 is a medium-severity vulnerability in Linux kernel, published on 25 Jan 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:
block: zero non-PI portion of auto integrity buffer
The auto-generated integrity buffer for writes needs to be fully initialized before being passed to the underlying block device, otherwise the uninitialized memory can be read back by userspace or anyone with physical access to the storage device. If protection information is generated, that portion of the integrity buffer is already initialized. The integrity data is also zeroed if PI generation is disabled via sysfs or the PI tuple size is 0. However, this misses the case where PI is generated and the PI tuple size is nonzero, but the metadata size is larger than the PI tuple. In this case, the remainder ("opaque") of the metadata is left uninitialized. Generalize the BLK_INTEGRITY_CSUM_NONE check to cover any case when the metadata is larger than just the PI tuple.
Weakness: CWE-908
Which versions are affected by CVE-2026-23007?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23007?
Apply the vendor's patch.
Is CVE-2026-23007 being exploited?
There is no known exploitation of CVE-2026-23007 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-23007, DEBIAN-CVE-2026-23007, GHSA-2mvm-xgm9-r324, ROOT-OS-DEBIAN-13-CVE-2026-23007, UBUNTU-CVE-2026-23007.