fpga: altera-cvp: Avoid out-of-bounds read in trailing byte write (CVE-2026-89730) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89730

fpga: altera-cvp: Avoid out-of-bounds read in trailing byte write

Answer in brief

CVE-2026-89730 records a Unknown severity vulnerability in fpga: altera-cvp: Avoid out-of-bounds read in trailing byte write. 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	>=34d1dc17ce978ae76e676d401b48fe9d004aa948 <b138bc665e21d4422382ab43aebdf0a2b7bb9cb3 \|\| >=34d1dc17ce978ae76e676d401b48fe9d004aa948 <827ec385458adeeda651de2b6f3537e386b1a8d9 \|\| >=34d1dc17ce978ae76e676d401b48fe9d004aa948 <4dc1051939e499c838229af035464a5fc7671198 \|\| >=34d1dc17ce978ae76e676d401b48fe9d004aa948 <9da70a43b5fea60d758137f7f0ccfe19356cb5bb	b138bc665e21d4422382ab43aebdf0a2b7bb9cb3, 827ec385458adeeda651de2b6f3537e386b1a8d9, 4dc1051939e499c838229af035464a5fc7671198, 9da70a43b5fea60d758137f7f0ccfe19356cb5bb
Linux/Linuxgeneric	4.14	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to b138bc665e21d4422382ab43aebdf0a2b7bb9cb3 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: fpga: altera-cvp: Avoid out-of-bounds read in trailing byte write The trailing byte path in altera_cvp_send_block() dereferences a u32 pointer even when only 1-3 bytes remain in the input buffer. If the buffer ends at a page or scatterlist boundary, this can read past the valid image data and fault. Copy the remaining bytes into a zero-initialized u32 before writing the final word so only valid bytes are read from the input buffer.

Quoted source text, attributed separately from HOL analysis.