Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-m8cg-xc2p-r3fc

rootless: `/sys/fs/cgroup` is writable when cgroupns isn't unshared in runc

CVSS 5.0 MediumEPSS 0.0032 · 25th percentile

Published by the GitHub Advisory Database at 30 Mar 2023, 20:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/opencontainers/runcGo<1.1.51.1.5
Identifiers
GHSA-m8cg-xc2p-r3fc · CVE-2023-25809 · GO-2023-1682
Weakness (CWE)
CWE-281
Tags
Published
30 Mar 2023
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

runc versions before 1.1.5 leave /sys/fs/cgroup writable in some rootless setups where the cgroup namespace is not unshared. A container started this way can write to the user-owned cgroup hierarchy on the host, though other users' hierarchies are not affected. Upgrade to runc 1.1.5, or until then run containers with a private cgroup namespace.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.0 Medium 3.1 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0032, the 25th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:43 UTC First seen by agentprime
  2. 31 Oct 2026, 14:43 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.