CVE record · CVE-2026-89921

KVM: s390: Zero initialize data structures for inject_pfault_token

No CVSS scoreEPSS 0.0022 · 12th 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 383d0b050106abecb82f43101cac94fa423af5cd to before 3da26db3323cbccf509005fdbc4ebae842d323cd git affected 383d0b050106abecb82f43101cac94fa423af5cd to before 5b0ae4443383fbacd905522f0c95ad6c85a3b43e git affected 383d0b050106abecb82f43101cac94fa423af5cd to before 7090818ba774d254eba80979c2d4da23d91de02f git affected 383d0b050106abecb82f43101cac94fa423af5cd to before ab1a8a3c9971200938093370da4c67d4427c25f2 git affected 383d0b050106abecb82f43101cac94fa423af5cd to before b8abc760fa18a389319d977834a30550b3ec18e8 git affected 383d0b050106abecb82f43101cac94fa423af5cd to before 9b046de62b8098af6e2ba820b125ec9dc5f162c8 git affected 383d0b050106abecb82f43101cac94fa423af5cd to before 134f235e0e8de54611a72d3cc3f63e5f31246baa git affected 383d0b050106abecb82f43101cac94fa423af5cd to before 4e2c7f7cbc27418f9a290399b986c1b85ff93b90 git Other versions: unaffected
Linux	Linux	affected 3.19 unaffected before 3.19 semver unaffected 5.10.273 to 5.10., inclusive semver unaffected 5.15.224 to 5.15., inclusive semver unaffected 6.1.191 to 6.1., inclusive semver unaffected 6.6.160 to 6.6., inclusive semver unaffected 6.12.112 to 6.12., inclusive semver unaffected 6.18.52 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-2026-89921
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.

This Linux kernel KVM issue affects the s390 pfault token injection path in multiple stable branches, with the vulnerable range starting at commit 383d0b050106 and fixed in several stable releases. An attacker with access to the host's migration ioctls can read stale stack values left in kernel data structures, though the source states that nothing leaks to the guest. Upgrade to a fixed Linux kernel release for your branch, or to 3.19 or later where the fix is included; the source lists fixed versions 5.10.273, 5.15.224, 6.1.191 and 6.6.160 and their later point releases.

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

No source has published a CVSS score for this record yet.

CISA KEV Not listed.
EPSS 0.0022, the 12th 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.