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
Published: 2026-09-10
Score: 7.8 High
EPSS: < 1% Very Low
KEV: No
Impact: Execution of container payload as host root privileges
Action: Patch Now
AI Analysis

Impact

A regression in crun 1.29 allows an attacker to run code from a container image with host root privileges when the runtime is built with libkrun and a rootful container is started with passt networking. This flaw is a CWE-269 weakness that can compromise the entire host system if an attacker supplies a malicious image. The vulnerability requires the specific configuration of rootful krun with passt networking, but once those prerequisites are met, arbitrary payload execution as root is possible.

Affected Systems

Red Hat Hardened Images, which include the crun container runtime built with libkrun. The flaw affects crun versions 1.29 and later. Users that employ rootful containers with passt networking in this environment are exposed, while non‑rootful or non‑passt configurations are not directly impacted.

Risk and Exploitability

The CVSS score of 7.8 indicates a high severity risk. EPSS data is not available, and the vulnerability is not yet listed in CISA’s KEV catalog, but the lack of public exploit evidence does not reduce the importance of remediation. An attacker with the ability to supply or modify a container image could exploit the vulnerability by launching a rootful container with passt networking, thereby executing privileged code on the host. The attack vector is inferred to be via the container image; direct exploitation requires these configuration conditions.

Generated by OpenCVE AI on September 10, 2026 at 09:21 UTC.

Remediation

Vendor Workaround

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


OpenCVE Recommended Actions

  • Upgrade to the latest crun release that addresses the regression as soon as it is available from the vendor.
  • If an update cannot be applied immediately, avoid running untrusted container images with krun and passt networking until a fixed crun is released.
  • Configure krun to use a different networking mode or disable passt networking for rootful containers to eliminate the privileged execution path.

Generated by OpenCVE AI on September 10, 2026 at 09:21 UTC.

Tracking

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Advisories

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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'}


Subscriptions

Containers Crun
Redhat Enterprise Linux Hardened Images Hummingbird Openshift
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
  • CWE-269

    Improper Privilege Management