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CVE-2026-84042 Details

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

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://access.redhat.com/security/cve/CVE-2026-84042	[email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2531222	[email protected]
https://github.com/containers/crun/	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-269	Improper Privilege Management	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

4 change records found show changes

Date	Action	Recorded By
Sep 15, 2026	CVE Modified	[email protected]
Sep 15, 2026	CVE Modified	[email protected]
Sep 10, 2026	CVE Modified	CISA-ADP
Sep 10, 2026	New CVE Received	[email protected]