net/tcp-ao: Fix MAC comparison to be constant-time (CVE-2026-43384) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-43384

net/tcp-ao: Fix MAC comparison to be constant-time

Answer in brief

CVE-2026-43384 records a Unknown severity vulnerability in net/tcp-ao: Fix MAC comparison to be constant-time. 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 May 8, 2026Updated Aug 5, 2026Source checked Sep 20, 2026First seen by HOL Aug 5, 2026Material review Aug 5, 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	>=0a3a809089eb1d4a0a2fd0c16b520d603988c859 <8be6ed64966da48b6c4726918f106c18742a5125 \|\| >=0a3a809089eb1d4a0a2fd0c16b520d603988c859 <a269cbdc442f8658bca35383e34b9d0b0ff95a1c \|\| >=0a3a809089eb1d4a0a2fd0c16b520d603988c859 <080b0e210088296dd50d6637c06c1db14246adfe \|\| >=0a3a809089eb1d4a0a2fd0c16b520d603988c859 <67edfec516d30d3e62925c397be4a1e5185802fc	8be6ed64966da48b6c4726918f106c18742a5125, a269cbdc442f8658bca35383e34b9d0b0ff95a1c, 080b0e210088296dd50d6637c06c1db14246adfe, 67edfec516d30d3e62925c397be4a1e5185802fc
Linux/Linuxgeneric	6.7	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 8be6ed64966da48b6c4726918f106c18742a5125 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
May 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 5, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: net/tcp-ao: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

Quoted source text, attributed separately from HOL analysis.