CVE-2026-80679 s390/dasd: Fix potential NULL pointer dereference
A NULL pointer dereference in the Linux kernel s390/dasd driver can cause a system crash, requiring a kernel patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80679?
CVE-2026-80679 is a 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/dasd: Fix potential NULL pointer dereference
dasd_release_space() checks the implementation of the is_ese() discipline function before calling it to determine if a given device is an ESE DASD.
The current usage of the logical AND operator will lead to a NULL pointer dereference as the function is called even if the function pointer is NULL.
Fix this by using the logical OR operator.
Which versions are affected by CVE-2026-80679?
How do I fix CVE-2026-80679?
Apply the vendor's patch.
Is CVE-2026-80679 being exploited?
There is no known exploitation of CVE-2026-80679 in the wild and no public exploit code.
Sources
Also known as AZL-98156, BELL-CVE-2026-80679, DEBIAN-CVE-2026-80679, GHSA-68wp-mw9w-2vpr, UBUNTU-CVE-2026-80679.