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Fencer Intel
high 7.8

CVE-2026-84042 json

Crun: crun: rootful krun with passt executes container payload as host root

published 2mo ago modified 15h ago also EUVD-2026-75321

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 0%
public exploits
0
none known

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. The issue is a regression in crun 1.29. It affects crun >= 1.29

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:1.30.1-1.el10_3
  • Red Hat Red Hat Enterprise Linux 9 0:1.29.1-1.el9
  • crun openSUSE Tumbleweed 1.30.1-1.1

opensuse advisories openSUSE-SU-2026:12162-1

  • crun Alpine 3.24 1.30.1-r0

alpine advisories ALPINE-CVE-2026-84042

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-84042 updated cvss 7.8

crun: crun: rootful krun with passt executes container payload as host root

  • Red Hat Enterprise Linux AppStream (v. 9) crun 1.29.1-1.el9
    fixed: vendor fix “Do not run untrusted images with krun and passt until a fixed crun is released.” RHSA-2026:97561
  • Red Hat Enterprise Linux AppStream (v. 10) crun 1.30.1-1.el10_3
    fixed: vendor fix “Do not run untrusted images with krun and passt until a fixed crun is released.” RHSA-2026:98561
  • Red Hat Enterprise Linux 8 crun Red Hat Hardened Images crun Red Hat OpenShift Container Platform 4 crun, openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2mo ago

Exploit prediction

0.10% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness
  • CWE-269 Improper Privilege Management

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.