Bug 2531222 (CVE-2026-84042) - CVE-2026-84042 crun: crun: rootful krun with passt executes container payload as host root
Summary: CVE-2026-84042 crun: crun: rootful krun with passt executes container payload...
Keywords:
Status: NEW
Alias: CVE-2026-84042
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-10 01:50 UTC by OSIDB Bzimport
Modified: 2026-11-10 13:59 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:97561 0 None None None 2026-11-10 13:59:20 UTC

Description OSIDB Bzimport 2026-09-10 01:50:26 UTC 
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 and 1.29.1. A patch is available upstream; no fixed release is published yet.
Comment 3 errata-xmlrpc 2026-11-10 13:59:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:97561 https://access.redhat.com/errata/RHSA-2026:97561
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