CVE-2026-68451 s390/zcrypt: Validate length for CCA ECC private key requests
A missing length validation in the Linux kernel s390/zcrypt driver allows attackers to trigger a buffer overflow via crafted CCA ECC private 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-2026-68451?
CVE-2026-68451 is a high-severity 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 ECC private key requests
cca_ecc2protkey() 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-2026-68451?
How do I fix CVE-2026-68451?
Apply the vendor's patch.
Is CVE-2026-68451 being exploited?
There is no known exploitation of CVE-2026-68451 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68451, DEBIAN-CVE-2026-68451, GHSA-4fv3-cqpg-5v3h, UBUNTU-CVE-2026-68451.