drm/panthor: harden firmware build-info bounds checks (CVE-2026-89826) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89826

drm/panthor: harden firmware build-info bounds checks

Answer in brief

CVE-2026-89826 records a Unknown severity vulnerability in drm/panthor: harden firmware build-info bounds checks. 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	>=2718d91816eeed03c09c8abe872e45f59078768c <5516f1acfd07564361cf306cc90a8e513df0f096 \|\| >=2718d91816eeed03c09c8abe872e45f59078768c <6ae19dce3e8c13ae73590b3f4311abe9f96bbae8 \|\| >=2718d91816eeed03c09c8abe872e45f59078768c <8321b093fa6c297b80586460ce6914d9655df170	5516f1acfd07564361cf306cc90a8e513df0f096, 6ae19dce3e8c13ae73590b3f4311abe9f96bbae8, 8321b093fa6c297b80586460ce6914d9655df170
Linux/Linuxgeneric	6.10	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 5516f1acfd07564361cf306cc90a8e513df0f096 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/panthor: harden firmware build-info bounds checks panthor_fw_read_build_info() checks whether the metadata range fits in the firmware image with hdr.meta_start + hdr.meta_size. Both fields are u32, so the addition can wrap and let an out-of-bounds range pass validation. The function also reads the "git_sha: " prefix without first checking that the metadata is long enough, and meta_size == 0 can underflow the NULL terminator index. Use subtraction-based bounds checking and reject metadata that is too short to contain the expected prefix and trailing NULL byte.

Quoted source text, attributed separately from HOL analysis.