KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save (CVE-2026-89912) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89912

KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save

Answer in brief

CVE-2026-89912 records a Unknown severity vulnerability in KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 16, 2026Source checked Sep 16, 2026First seen by HOL Sep 16, 2026Material review Sep 16, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=eff484e0298da5a4d18ca82f5454c557fd942af5 <3d4c26b16a04a084fe0bde08ccdd8086570f8bbe \|\| >=eff484e0298da5a4d18ca82f5454c557fd942af5 <36df368861d2664291298feeb37dfef43fcae670 \|\| >=eff484e0298da5a4d18ca82f5454c557fd942af5 <c6c156d931c33b92362383cf76f6d6e1291dcbfe	3d4c26b16a04a084fe0bde08ccdd8086570f8bbe, 36df368861d2664291298feeb37dfef43fcae670, c6c156d931c33b92362383cf76f6d6e1291dcbfe
Linux/Linuxgeneric	4.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 3d4c26b16a04a084fe0bde08ccdd8086570f8bbe if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 16, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save MAPC with V=0 drops ite->collection but leaves the ITE on the device's ITT list, and vgic_its_save_ite() dereferences it unconditionally. A guest that issues MAPD, MAPTI and then MAPC(V=0) therefore oopses the host when the VMM issues KVM_DEV_ARM_ITS_SAVE_TABLES to migrate it. That sequence is UNPREDICTABLE per the architecture, but KVM already handles the resulting state in the translate, MOVI and DISCARD paths. Save a zeroed entry, which vgic_its_restore_ite() reads back as invalid. Skipping the ITE instead would leave the ITT slot holding whatever is in guest memory, and restore rejects an entry naming a collection the restored collection table does not have.

Quoted source text, attributed separately from HOL analysis.