CVE-2026-89920KVM: s390: Fix memory corruption by not reinjecting CK machine checks
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 before 6ee52d3af2a1bf70349cf3f860933c8d221e229a; from 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 before 7077ec953996acc04b49d1dfc43df1c1a2a74395; from 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 before 546dde823a36d7283dcf46127c2f3d093443860f | CNA record |
References
- https://git.kernel.org/stable/c/6ee52d3af2a1bf70349cf3f860933c8d221e229a
- https://git.kernel.org/stable/c/7077ec953996acc04b49d1dfc43df1c1a2a74395
- https://git.kernel.org/stable/c/546dde823a36d7283dcf46127c2f3d093443860f
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.