CVE-2026-68452 s390/zcrypt: Validate length for CCA AES cipher key requests
A missing length validation in the s390/zcrypt driver allows attackers to trigger memory corruption via crafted AES key requests.
- 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-2026-68452?
CVE-2026-68452 is a high-severity memory corruption vulnerability in Linux, published on 13 Aug 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:
s390/zcrypt: Validate length for CCA AES cipher key requests
cca_cipher2protkey() derives the copy length for the CPRB parameter block directly from the length field in the key token. Reject the request early if the token length exceeds the available space in the parameter block.
Weakness: CWE-120
Which versions are affected by CVE-2026-68452?
How do I fix CVE-2026-68452?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-68452 being exploited?
There is no known exploitation of CVE-2026-68452 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68452, DEBIAN-CVE-2026-68452, GHSA-wcc3-pw65-4r46, UBUNTU-CVE-2026-68452.