Security Flaw in crun Affects Container Privilege Management by Red Hat
CVE-2026-84042

7.8HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Hardened Images
Vendor
CVE Published:
10 September 2026

What is CVE-2026-84042?

A vulnerability has been identified in crun, specifically when built with libkrun. This flaw allows an attacker to execute malicious payloads from a container image with root privileges on the host system when the container is started in a rootful mode with passt networking enabled. The issue represents a regression starting from crun version 1.29, necessitating urgent attention to ensure secure container operations and prevent potential exploitation.

References

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

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.