Detections
Analytics
CVE-2026-89920
high
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix memory corruption by not reinjecting CK machine checks Channel-subsystem damage machine checks are for the host channel subsystem. The guest channel subsystem is emulated in the userspace VMM. There is no point in forwarding such machine checks into the guest. This also simplifies the machine check reinjection and avoids kfree of a stack variable as reported by sashiko. There might be still machine checks that have the ck bit set with another bit (like instruction damage), mask out the CK bit in s390_backup_mcck_info(), like the CP and ED bits already are.
References
https://git.kernel.org/stable/c/b7631982fb65dd355acd18e62b384bc8125e9c44
https://git.kernel.org/stable/c/7077ec953996acc04b49d1dfc43df1c1a2a74395
https://git.kernel.org/stable/c/6ee52d3af2a1bf70349cf3f860933c8d221e229a
https://git.kernel.org/stable/c/5c63e2ed840c85e27172ab78e7db3ac77fba281b
https://git.kernel.org/stable/c/546dde823a36d7283dcf46127c2f3d093443860f