High [CVE-2026-84042] rootful krun with passt executes container payload as host root
This high-severity Red Hat Linux advisory covers CVE-2026-84042 affecting Red Hat Hardened Images.
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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.
It affects crun >= 1.29 Red Hat severity: Important — CVSS 7.8 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H). Weakness: CWE-269.
Affected Red Hat products: Red Hat Hardened Images. Red Hat does not currently list a fixing RHSA for this CVE.
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Do not run untrusted images with krun and passt until a fixed crun is released.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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