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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| 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 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | crun | No fix yet | — |
| Ubuntu 26.04 LTS | crun | No fix yet | — |
| Ubuntu 24.04 LTS | crun | No fix yet | — |
| Ubuntu 22.04 LTS | crun | No fix yet | — |
| Ubuntu 20.04 LTS | crun | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | crun | 1.30.1-1.el10_3 | RHSA-2026:98561 |
| RHEL 9 | crun | 1.29.1-1.el9 | RHSA-2026:97561 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | crun | 1.29.1-1.el9 | RLSA-2026:97561 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | crun | 1.30.1-1.1 | openSUSE-SU-2026:12162-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | crun | 1.30.1-r0 | — |
Advisories 5
- RHSA-2026:98561 Red Hat Security Advisory: crun security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:97561 Red Hat Security Advisory: crun security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RLSA-2026:97561 Important: crun security, bug fix, and enhancement update Rocky Linux Security Advisories · Nov 13, 2026
- WID-SEC-2026-4490 Red Hat Enterprise Linux (crun): Schwachstelle ermöglicht Ausführen von beliebigem Programmcode mit Administratorrechten BSI CERT-Bund (WID) · Nov 11, 2026
- openSUSE-SU-2026:12162-1 crun-1.30.1-1.1 on GA media SUSE / openSUSE Security Updates · Oct 18, 2026
References
- RHSA-2026:97561 vendor-advisory
- RHSA-2026:98561 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-84042 vdb-entry
- RHBZ#2531222 issue-tracking
- https://github.com/containers/crun/