CVE-2023-6476 Cri-o: pods are able to break out of resource confinement on cgroupv2
An attacker can use an experimental annotation to bypass resource limits, allowing pods to consume all node resources and cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-6476?
CVE-2023-6476 is a medium-severity vulnerability in Redhat Openshift Container Platform, published on 9 Jan 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in CRI-O that involves an experimental annotation leading to a container being unconfined. This may allow a pod to specify and get any amount of memory/cpu, circumventing the kubernetes scheduler and potentially resulting in a denial of service in the node.
Weakness: CWE-770
Which versions are affected by CVE-2023-6476?
7 open source packages ship an affected version, including github.com/cri-o/cri-o. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/cri-o/cri-o Go | All versions | 1.27.3, 1.28.3, 1.29.1 |
github.com/cri-o/cri-o Go | All versions | 1.27.3 |
github.com/cri-o/cri-o Go | All versions | 1.27.3 |
github.com/cri-o/cri-o Go | From 1.28.0 | 1.28.3 |
github.com/cri-o/cri-o Go | From 1.28.0 | 1.28.3 |
github.com/cri-o/cri-o Go | From 1.29.0 | 1.29.1 |
1 more packages
github.com/cri-o/cri-o Go | From 1.29.0 | 1.29.1 |
Linux distribution packages (6)
cri-o Red Hat:openshift:4.13::el8 | All versions | 0:1.26.4-6.1.rhaos4.13.git9eb9cf3.el8 |
cri-o-debuginfo Red Hat:openshift:4.13::el8 | All versions | 0:1.26.4-6.1.rhaos4.13.git9eb9cf3.el8 |
cri-o-debugsource Red Hat:openshift:4.13::el8 | All versions | 0:1.26.4-6.1.rhaos4.13.git9eb9cf3.el8 |
cri-o Red Hat:openshift:4.13::el9 | All versions | 0:1.26.4-6.1.rhaos4.13.git9eb9cf3.el9 |
cri-o-debuginfo Red Hat:openshift:4.13::el9 | All versions | 0:1.26.4-6.1.rhaos4.13.git9eb9cf3.el9 |
cri-o-debugsource Red Hat:openshift:4.13::el9 | All versions | 0:1.26.4-6.1.rhaos4.13.git9eb9cf3.el9 |
Products include Redhat Openshift Container Platform.
How do I fix CVE-2023-6476?
Upgrade github.com/cri-o/cri-o to a fixed version for your release line: 1.27.3, 1.28.3 or 1.29.1.
Is CVE-2023-6476 being exploited?
There is no known exploitation of CVE-2023-6476 in the wild and no public exploit code.
Other vulnerabilities in Redhat Openshift Container Platform
- CVE-2020-27836 Missing authorization in cluster-ingress-operator
- CVE-2018-1085 Misconfiguration in openshift-ansible
- CVE-2026-54099 Privilege escalation in Red Hat OpenShift Container Platform 4
- CVE-2026-1784 Ose-cluster-ingress-operator: remote code execution through haproxy configuration injection
- CVE-2021-20182 Privilege escalation in openshift
Sources
Also known as AZL-53405, GHSA-p4rx-7wvg-fwrc, GO-2024-2458, RHSA-2024:0195.