CVE-2026-80709 s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs
A missing bounds check in the s390/zcrypt driver allows heap memory corruption, potentially enabling code execution or privilege escalation on affected systems.
- 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-2026-80709?
CVE-2026-80709 is a high-severity memory corruption vulnerability in Linux, published on 28 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: Fix wrong domain value verification with EP11 CPRBs
There is a wrong upper limit check for the domain value when an EP11 CPRB is processed for sending to a crypto card. This check is only active on custom device nodes but may lead to access heap memory behind perms->adm when an administrative CPRB is sent. Add correct limit (AP_DOMAINS = 256) checking to fix this.
Which versions are affected by CVE-2026-80709?
How do I fix CVE-2026-80709?
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-2026-80709 being exploited?
There is no known exploitation of CVE-2026-80709 in the wild and no public exploit code.
Sources
Also known as AZL-98120, BELL-CVE-2026-80709, DEBIAN-CVE-2026-80709, GHSA-w33j-vhfx-hgqc, UBUNTU-CVE-2026-80709.