media: v4l2-async: avoid deleting unlinked ASC entry on link error (CVE-2026-89874) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89874

media: v4l2-async: avoid deleting unlinked ASC entry on link error

Answer in brief

CVE-2026-89874 records a Unknown severity vulnerability in media: v4l2-async: avoid deleting unlinked ASC entry on link error. 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	>=28a1295795d85a25f2e7dd391c43969e95fcb341 <d273571e531405426983c6a45ec635c7d0415eed \|\| >=28a1295795d85a25f2e7dd391c43969e95fcb341 <caac13f518d83974e9884d1eeda3d4cc3bb92978 \|\| >=28a1295795d85a25f2e7dd391c43969e95fcb341 <3345746e0957bce6c53644838e4955710a82a962 \|\| >=28a1295795d85a25f2e7dd391c43969e95fcb341 <a57d94026cb4fd7b3d258f0db2ad391cbccfaba5 \|\| >=28a1295795d85a25f2e7dd391c43969e95fcb341 <47d82b605351c0e04f6365e42c8ffe2fcfdba615	d273571e531405426983c6a45ec635c7d0415eed, caac13f518d83974e9884d1eeda3d4cc3bb92978, 3345746e0957bce6c53644838e4955710a82a962, a57d94026cb4fd7b3d258f0db2ad391cbccfaba5, 47d82b605351c0e04f6365e42c8ffe2fcfdba615
Linux/Linuxgeneric	6.6	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to d273571e531405426983c6a45ec635c7d0415eed 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: media: v4l2-async: avoid deleting unlinked ASC entry on link error v4l2_async_match_notify() creates ancillary media links before adding asc->asc_subdev_entry to sd->asc_list. If ancillary link creation fails, the function jumps to err_call_unbind while asc_subdev_entry has not been linked yet. Async connections are zero-allocated, so the list entry still has NULL next and prev pointers on this path. Calling list_del() on it can therefore dereference NULL instead of returning the original link creation error. Do not delete asc_subdev_entry from err_call_unbind. There is no list insertion to undo on this path; the bound callback and sub-device registration are the operations that need to be rolled back.

Quoted source text, attributed separately from HOL analysis.