CVE-2025-71155 KVM: s390: Fix gmap_helper_zap_one_page() again
Missing checks in KVM s390 gmap helper allow guest memory corruption, potentially leading to code execution or 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-2025-71155?
CVE-2025-71155 is a high-severity memory corruption vulnerability in Linux kernel, published on 23 Jan 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 gmap_helper_zap_one_page() again
A few checks were missing in gmap_helper_zap_one_page(), which can lead to memory corruption in the guest under specific circumstances.
Add the missing checks.
Weakness: CWE-787
Which versions are affected by CVE-2025-71155?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-71155?
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-2025-71155 being exploited?
There is no known exploitation of CVE-2025-71155 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-71155, DEBIAN-CVE-2025-71155, GHSA-73rm-3q3v-37g4, UBUNTU-CVE-2025-71155.