iommufd: Release current IOAS on xa_store() failure (CVE-2026-89446) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89446

iommufd: Release current IOAS on xa_store() failure

Answer in brief

CVE-2026-89446 records a Unknown severity vulnerability in iommufd: Release current IOAS on xa_store() failure. 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 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 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	>=051ae5aa73d782a8be2699a11e17c68f28b4e758 <4c33d00ad9a911e87ea222986f732ce072e3aa26 \|\| >=051ae5aa73d782a8be2699a11e17c68f28b4e758 <07b4fe1367f076886c1c47a19c70936138325087 \|\| >=051ae5aa73d782a8be2699a11e17c68f28b4e758 <4ac2ce123824d5f885c868fa1f9f4d463141a2ba	4c33d00ad9a911e87ea222986f732ce072e3aa26, 07b4fe1367f076886c1c47a19c70936138325087, 4ac2ce123824d5f885c868fa1f9f4d463141a2ba
Linux/Linuxgeneric	6.13	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 4c33d00ad9a911e87ea222986f732ce072e3aa26 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: iommufd: Release current IOAS on xa_store() failure iommufd_take_all_iova_rwsem() takes an object reference and the iova_rwsem write lock before storing the IOAS in the temporary ioas_list xarray. If xa_store() fails, the current IOAS has not been inserted into ioas_list yet. iommufd_release_all_iova_rwsem() only unwinds IOAS objects already present in that xarray, so it cannot release the current IOAS. Release the current IOAS rwsem and object reference before unwinding the previously stored entries.

Quoted source text, attributed separately from HOL analysis.