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

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Fixes

Solution

No solution given by the vendor.


Workaround

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

History

Tue, 15 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat enterprise Linux
Redhat openshift
CPEs cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat enterprise Linux
Redhat openshift

Sun, 13 Sep 2026 20:00:00 +0000

Type Values Removed Values Added
First Time appeared Containers
Containers crun
Redhat hardened Images
Vendors & Products Containers
Containers crun
Redhat hardened Images

Thu, 10 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 10 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Thu, 10 Sep 2026 08:30:00 +0000

Type Values Removed Values Added
Description 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
Title Crun: crun: rootful krun with passt executes container payload as host root
First Time appeared Redhat
Redhat hummingbird
Weaknesses CWE-269
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-15T16:23:21.048Z

Reserved: 2026-09-01T03:55:17.620Z

Link: CVE-2026-84042

cve-icon Vulnrichment

Updated: 2026-09-10T17:34:06.864Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-10T09:17:03.260

Modified: 2026-09-15T17:17:28.130

Link: CVE-2026-84042

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-10T00:00:00Z

Links: CVE-2026-84042 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-13T19:45:17Z

Weaknesses