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.
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:HAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 4d62fcc0b692e3b4058d7d138114c27cd8b011f7, < 045f3e95a0deccb277c29bd003e1d43c0ad40c90; >= 4d62fcc0b692e3b4058d7d138114c27cd8b011f7, < 5c63e2ed840c85e27172ab78e7db3ac77fba281b; >= 4d62fcc0b692e3b4058d7d138114c27cd8b011f7, < b7631982fb65dd355acd18e62b384bc8125e9c44; >= 4d62fcc0b692e3b4058d7d138114c27cd8b011f7, < 6ee52d3af2a1bf70349cf3f860933c8d221e229a; >= 4d62fcc0b692e3b4058d7d138114c27cd8b011f7, < 7077ec953996acc04b49d1dfc43df1c1a2a74395; >= 4d62fcc0b692e3b4058d7d138114c27cd8b011f7, < 546dde823a36d7283dcf46127c2f3d093443860f |
| Linux | Linux | 4.13 |
References
- https://git.kernel.org/stable/c/045f3e95a0deccb277c29bd003e1d43c0ad40c90
- https://git.kernel.org/stable/c/546dde823a36d7283dcf46127c2f3d093443860f
- https://git.kernel.org/stable/c/5c63e2ed840c85e27172ab78e7db3ac77fba281b
- https://git.kernel.org/stable/c/6ee52d3af2a1bf70349cf3f860933c8d221e229a
- https://git.kernel.org/stable/c/7077ec953996acc04b49d1dfc43df1c1a2a74395
- https://git.kernel.org/stable/c/b7631982fb65dd355acd18e62b384bc8125e9c44
Timeline
- Published
- Sep 16, 2026
- Last modified
- Oct 30, 2026
- NVD status
- Received