Docker Desktop WSL2 AF_VSOCK isolation bypass via 32-bit socketcall

Summary

In Docker Desktop for Windows with the WSL2 backend, an unprivileged Linux container can use 32-bit socketcall to bypass the default seccomp restriction on AF_VSOCK. This can expose host-facing services and Windows files accessible to the logged-in user. The issue affects x86-64 WSL2; LinuxKit-based backends are unaffected. The issue is fully fixed only with Docker Desktop 4.98.0 or later and WSL 3.0.3 or later. Docker Desktop 4.98.0 or later running on an older WSL remains affected.

Remediation

1. Inventory every Docker Docker Desktop deployment, including staging.
2. Upgrade Docker Docker Desktop to 4.98.0.
3. Confirm the running version after the upgrade.

References

• Referencehttps://docs.docker.com/desktop/release-notes/#4980
• Referencehttps://github.com/microsoft/WSL/releases/tag/3.0.3
• Referencehttps://github.com/microsoft/WSL2-Linux-Kernel/releases/tag/linux-msft-wsl-6.18.54.1