CVE-2026-89920
CVE CVE-2026-89920EUVD EUVD-2026-80520Published 2026-09-16T10:32:14.000ZLast changed 2026-09-16T14:40:14.000ZCVSS 7.8
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 7.2.5; patch: 7.3-rc1; 4.13; 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 <546dde823a36d7283dcf46127c2f3d093443860f; patch: 0; patch: 6.18.51; 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 <7077ec953996acc04b49d1dfc43df1c1a2a74395; 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 <6ee52d3af2a1bf70349cf3f860933c8d221e229a
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
Does this concern one of your customers?
This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.
Try it for 28 daysPatchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.