Log in Start free

Vulnerability · Published Sep 10, 2026 · Assigned by redhat

CVE-2026-84042Crun: crun: rootful krun with passt executes container payload as host root

High 7.8

In plain English

A high-severity privilege mismanagement in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.1%top 99.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.24crun1.30.1-r0ALPINE-CVE-2026-84042
Ubuntu:22.04:LTScrunno fix listedUBUNTU-CVE-2026-84042
Ubuntu:24.04:LTScrunno fix listedUBUNTU-CVE-2026-84042
Ubuntu:26.04:LTScrunno fix listedUBUNTU-CVE-2026-84042
Ubuntu:26.10crunno fix listedUBUNTU-CVE-2026-84042

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Hardened Images see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 5 see references

Weakness: CWE-269 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References