Severity by source
AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
AV:L for local container execution requirement; AC:H for three stacked prerequisites (libkrun build, rootful mode, passt); S:C for container-to-host escape yielding full C/I/A.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
2DescriptionCVE.org
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
AnalysisAI
Container escape in crun >= 1.29, when built with libkrun and started rootful with passt networking (krun.use_passt), allows an attacker who controls the container image to execute arbitrary code with host root privileges. This is a regression introduced in crun 1.29, meaning environments that recently upgraded are at risk while those on earlier versions are not. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all three of the following conditions to be simultaneously present: (1) crun is compiled with libkrun support, which is not a default build option in most distributions; (2) the container is started in rootful mode (not rootless); and (3) the krun.use_passt passt networking option is configured for the container. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 vector (AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H) accurately reflects both the severity ceiling and the access prerequisites: local execution with low privilege is required, and the high attack complexity stems from three simultaneously required configuration conditions - libkrun-enabled build, rootful container mode, and passt networking. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Consult the upstream crun release page at https://github.com/containers/crun/ and the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-84042 for a patched release; no specific fixed version number is confirmed in the available data, so tracking the repository for a release that addresses the regression from 1.29 is required. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: verify crun version and configuration across your infrastructure using 'crun --version' and checking krun.use_passt settings; identify which hosts run crun 1.29+ with libkrun and passt networking enabled. …
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-75321
GHSA-ggww-wrxv-mmw2