drm/amdgpu: clamp the isolation index for rings outside a partition (CVE-2026-89814) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89814

drm/amdgpu: clamp the isolation index for rings outside a partition

Answer in brief

CVE-2026-89814 records a Unknown severity vulnerability in drm/amdgpu: clamp the isolation index for rings outside a partition. The current sources do not mark it as known exploited. The current feed maps 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: 1 mapped package or product
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). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <964de255497ffd7cb8a86e405b8ac6d927e7e177 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0bfb938182d1313e5cac32ae38dbaaa4eabe4af4 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b30900566642ceb2c9e12b56c2afec28d0fd91a0 \|\| >=0 <6.18.51 \|\| >=0 <7.2.5	964de255497ffd7cb8a86e405b8ac6d927e7e177, 0bfb938182d1313e5cac32ae38dbaaa4eabe4af4, b30900566642ceb2c9e12b56c2afec28d0fd91a0, 6.18.51, 7.2.5

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux.
Review the reported fix. Update Linux/Linux to 964de255497ffd7cb8a86e405b8ac6d927e7e177 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: drm/amdgpu: clamp the isolation index for rings outside a partition adev->isolation[] has one slot per partition, but a ring that is not assigned to one keeps AMDGPU_XCP_NO_PARTITION, which is ~0, so indexing the array with it is out of bounds. SDMA submissions hit this on both the isolation enforcement and the VM flush path and trip UBSAN. Fall back to the first slot the way the cleaner shader path already does, and stop taking the address before the ring type check that makes it relevant.

Quoted source text, attributed separately from HOL analysis.