With the exploits published as-is, you'll only get root inside the container: there's no explicit namespace break, and calling setuid() in a container just gives you root in the container.
However, it can be used to modify files that are passed into the container (e.g. Docker run -v), or files that are shared with other containers (e.g. other Docker containers sharing the same layers). kube-proxy with Kubernetes happens to share a trusted binary with containers by default, which is how it can be exploited: https://github.com/Percivalll/Copy-Fail-CVE-2026-31431-Kuber...
You don't need any setuid binaries. You could just as easily use the vulnerability to add a job to crontab(5) that causes the cron daemon to run whatever you want as root.
With the exploits published as-is, you'll only get root inside the container: there's no explicit namespace break, and calling setuid() in a container just gives you root in the container.
However, it can be used to modify files that are passed into the container (e.g. Docker run -v), or files that are shared with other containers (e.g. other Docker containers sharing the same layers). kube-proxy with Kubernetes happens to share a trusted binary with containers by default, which is how it can be exploited: https://github.com/Percivalll/Copy-Fail-CVE-2026-31431-Kuber...
It's poisoning the filesystem cache, if you don't have a setuid binary handy you just poison anything else that gets executed by the host.
You don't need any setuid binaries. You could just as easily use the vulnerability to add a job to crontab(5) that causes the cron daemon to run whatever you want as root.
And your containers need to have specific capabilities enabled, which aren't by default on kubernetes and podman.
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