CVE-2026-72293 KVM: s390: vsie: Add missing radix_tree_preload() in _gaccess_shadow_fault()
A missing memory preload in the Linux kernel's KVM s390 subsystem can cause a denial of service by preventing forward progress during shadow faults.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72293?
CVE-2026-72293 is a denial of service vulnerability in Linux, published on 15 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:
KVM: s390: vsie: Add missing radix_tree_preload() in _gaccess_shadow_fault()
Add missing radix_tree_preload() in _gaccess_shadow_fault() to guarantee forward progress. The core of _gaccess_shadow_fault() has been split into ___gaccess_shadow_fault() in order to simplify locking.
Which versions are affected by CVE-2026-72293?
How do I fix CVE-2026-72293?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-72293 being exploited?
There is no known exploitation of CVE-2026-72293 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-72293, GHSA-qq97-53wh-89w9, UBUNTU-CVE-2026-72293.