CVE-2026-84042

Summary

A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29

Affected Software

Weaknesses

• CWE-269: Improper Privilege Management

Workarounds

Do not run untrusted images with krun and passt until a fixed crun is released.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://access.redhat.com/security/cve/CVE-2026-84042
• https://bugzilla.redhat.com/show_bug.cgi?id=2531222
• https://github.com/containers/crun/

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