CVE-2026-89925 KVM: s390: Fix memory leak in guest debug handling
A memory leak in KVM s390 guest debug handling allows local attackers to exhaust kernel memory, causing denial of service.
- 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-2026-89925?
CVE-2026-89925 is a memory corruption vulnerability in Linux, published on 16 Sep 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:
KVM: s390: Fix memory leak in guest debug handling
bp_data is freed only for the error case by kfree(bp_data). Every successful KVM_SET_GUEST_DEBUG will leak bp_data.
Which versions are affected by CVE-2026-89925?
How do I fix CVE-2026-89925?
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-2026-89925 being exploited?
There is no known exploitation of CVE-2026-89925 in the wild and no public exploit code.
Sources
Also known as AZL-101594, BELL-CVE-2026-89925, DEBIAN-CVE-2026-89925, GHSA-xj9r-76p8-pxqw, UBUNTU-CVE-2026-89925.