runc AppArmor bypass with symlinked /proc

Answer in brief

CVE-2023-28642 records a Medium severity (CVSS 6.1) vulnerability in runc AppArmor bypass with symlinked /proc. The current sources do not mark it as known exploited. The current feed maps github.com/opencontainers/runc (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Mar 30, 2023Updated Sep 10, 2026Source checked Sep 10, 2026First seen by HOL Sep 10, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.1. 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 github.com/opencontainers/runc (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
github.com/opencontainers/runcgo	>=0 <1.1.5	1.1.5

Recommended response

Check inventory. Check lockfiles and deployed manifests for github.com/opencontainers/runc.
Review the reported fix. Update github.com/opencontainers/runc to 1.1.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Mar 30, 2023
Evidence: source:osv:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:record
First seen by HOL
Sep 10, 2026

Sources and claim methodology

Upstream source description

### Impact It was found that AppArmor, and potentially SELinux, can be bypassed when `/proc` inside the container is symlinked with a specific mount configuration. ### Patches Fixed in runc v1.1.5, by prohibiting symlinked `/proc`: https://github.com/opencontainers/runc/pull/3785 This PR fixes CVE-2023-27561 as well. ### Workarounds Avoid using an untrusted container image.

Quoted source text, attributed separately from HOL analysis.