CVE-2026-89920

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89920

Key Details

CVE	CVE-2026-89920
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is high; privileges required is low; user interaction is none; scope is changed; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89920
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89920

Source

Reference

NVD

CVE