drm/sysfb: ofdrm: Fix integer overflow in fb_size calculation (CVE-2026-89806) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89806

drm/sysfb: ofdrm: Fix integer overflow in fb_size calculation

Answer in brief

CVE-2026-89806 records a Unknown severity vulnerability in drm/sysfb: ofdrm: Fix integer overflow in fb_size calculation. 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	>=c8a17756c42581ba1a567d1dd3b69e8f5619a7d8 <ded6ad826fe0fd059333d3a3b3e1742c8e45ff41 \|\| >=c8a17756c42581ba1a567d1dd3b69e8f5619a7d8 <d9daf9a6e7a6f82ef338a09386eefc6807100d3f \|\| >=c8a17756c42581ba1a567d1dd3b69e8f5619a7d8 <c6f48e59ece0123f6a11527ad4d89b21c2d65b87	ded6ad826fe0fd059333d3a3b3e1742c8e45ff41, d9daf9a6e7a6f82ef338a09386eefc6807100d3f, c6f48e59ece0123f6a11527ad4d89b21c2d65b87
Linux/Linuxgeneric	6.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to ded6ad826fe0fd059333d3a3b3e1742c8e45ff41 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/sysfb: ofdrm: Fix integer overflow in fb_size calculation The framebuffer size calculation `fb_size = linebytes * height` can overflow when both values are large (e.g., 46341 * 46341 > INT_MAX). Since linebytes and height are both int types, the multiplication is performed as int * int, which results in undefined behavior on overflow. Use check_mul_overflow() to detect and prevent this overflow, consistent with the approach used in simpledrm.c and corebootdrm.c.

Quoted source text, attributed separately from HOL analysis.