CVE record · CVE-2026-89920

KVM: s390: Fix memory corruption by not reinjecting CK machine checks

CVSS 7.8 HighEPSS 0.0018 · 7th percentile

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Linux	Linux	affected 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 to before 045f3e95a0deccb277c29bd003e1d43c0ad40c90 git affected 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 to before 5c63e2ed840c85e27172ab78e7db3ac77fba281b git affected 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 to before b7631982fb65dd355acd18e62b384bc8125e9c44 git affected 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 to before 6ee52d3af2a1bf70349cf3f860933c8d221e229a git affected 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 to before 7077ec953996acc04b49d1dfc43df1c1a2a74395 git affected 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 to before 546dde823a36d7283dcf46127c2f3d093443860f git Other versions: unaffected
Linux	Linux	affected 4.13 unaffected before 4.13 semver unaffected 6.1.191 to 6.1., inclusive semver unaffected 6.6.160 to 6.6., inclusive semver unaffected 6.12.114 to 6.12., inclusive semver unaffected 6.18.51 to 6.18., inclusive semver unaffected 7.2.5 to 7.2., inclusive semver unaffected 7.3 to , inclusive original_commit_for_fix Other versions: affected

Identifiers: CVE-2026-89920
CNA: Linux
Tags: Linux kernel
Published: 16 Sept 2026
Updated: 30 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

KVM for s390 in the Linux kernel, from 4.13 until fixed, can suffer memory corruption from reinjected channel-subsystem machine checks. The source gives few details on what an attacker needs. Upgrade to Linux 6.1.191, 6.6.160, 6.12.114, 6.18.51, or a later stable release in those series.

Written 12 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.8	High	3.1	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H	CNA (Linux)

CISA KEV Not listed.
EPSS 0.0018, the 7th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 16 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.