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crun CVE-2026-84042

| EUVDEUVD-2026-75321 HIGH
Improper Privilege Management (CWE-269)
2026-09-10 redhat GHSA-ggww-wrxv-mmw2
7.8
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
7.8 HIGH
AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
vuln.today AI
7.8 HIGH

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.

3.1 AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Sep 10, 2026 - 09:01 vuln.today
CVE Published
Sep 10, 2026 - 08:24 cve.org
HIGH 7.8

DescriptionCVE.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

Access
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Delivery
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Exploit
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Execution
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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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CVE-2026-84042 vulnerability details – vuln.today

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