bpf: Fix potential UAF when reading bpf link info (CVE-2026-90392) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90392

bpf: Fix potential UAF when reading bpf link info

Answer in brief

CVE-2026-90392 records a Unknown severity vulnerability in bpf: Fix potential UAF when reading bpf link info. 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 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 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	>=0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <a5c936ac904767fc1d943d40b0308bcb2ae2509b \|\| >=0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <d7d7208e2603b45724b684f4df73904fb347741e \|\| >=0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <85cf991c881e7198be32be05a9daa2625390c8b3 \|\| >=0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <79347e42cfbc9e78872922e8f08a70609c9af82f \|\| >=0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <863f3ddd0b8ac65abfb50d3be0869268ac0e277b	a5c936ac904767fc1d943d40b0308bcb2ae2509b, d7d7208e2603b45724b684f4df73904fb347741e, 85cf991c881e7198be32be05a9daa2625390c8b3, 79347e42cfbc9e78872922e8f08a70609c9af82f, 863f3ddd0b8ac65abfb50d3be0869268ac0e277b
Linux/Linuxgeneric	5.7	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to a5c936ac904767fc1d943d40b0308bcb2ae2509b if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix potential UAF when reading bpf link info In bpf_link_show_fdinfo and bpf_link_get_info_by_fd, link->prog is accessed without holding any locks. If the prog is concurrently replaced via bpf_link_update, the old prog can be freed, leading to a potential UAF issue. Fix this by accessing link->prog under RCU protection to safely fetch the pointer and guarantee its lifetime while reading its fields.

Quoted source text, attributed separately from HOL analysis.