CVE-2026-89920
HIGH
MEDIUM
Priority: 0.01
BB Relevance:
31/100
Published: 2026-09-16
Modified: 2026-10-30
First seen: 2026-10-30
Status: active
Attack Surface
No Interaction
Conf. Impact
Integ. Impact
Scope Change
CVSS Vector Breakdown
AV:
Local
AC:
High
PR:
Low
UI:
None
S:
Changed
C:
High
I:
High
A:
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.
Affected Software (7)
| Vendor | Product | Version |
|---|---|---|
| Linux | Linux | 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 < 045f3e95a0deccb277c29bd003e1d43c0ad40c90 |
| Linux | Linux | 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 < 5c63e2ed840c85e27172ab78e7db3ac77fba281b |
| Linux | Linux | 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 < b7631982fb65dd355acd18e62b384bc8125e9c44 |
| Linux | Linux | 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 < 6ee52d3af2a1bf70349cf3f860933c8d221e229a |
| Linux | Linux | 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 < 7077ec953996acc04b49d1dfc43df1c1a2a74395 |
| Linux | Linux | 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 < 546dde823a36d7283dcf46127c2f3d093443860f |
| Linux | Linux | 4.13 |