CVE-2024-50264

What it actually does

Dangling pointer in vsk->trans during virtio vsock loopback communication creates a Use-After-Free condition in the Linux kernel.

Why it matters to the business

Potential kernel memory corruption on Linux systems can lead to crashes, denial of service, or privilege escalation, disrupting operations and increasing breach risk across server and endpoint fleets.

How an attack unfolds

An attacker establishes loopback vsock communication to leave a dangling pointer in vsk->trans, then triggers reuse of the freed object to corrupt kernel memory for code execution or denial of service.

How to fix it

Upgrade the Linux kernel to a version containing the fix that initializes vsk->trans to NULL; apply vendor-supplied packages as soon as available.

How to confirm the fix worked

Verify kernel source or changelog contains the NULL initialization of vsk->trans; confirm running kernel version matches or exceeds the fixed release.

Typical attack path

1. Establish virtio vsock loopback connection between processes
2. Trigger path that leaves vsk->trans as dangling pointer
3. Reuse freed object to perform memory corruption
4. Escalate privileges or cause kernel panic

How to detect it

Review kernel logs for virtio_vsock or vsock related crashes and UAF warnings; correlate with process activity using vsock sockets.

What your security team should do

• Prioritize kernel updates on all exposed Linux systems
• Monitor EPSS and threat intelligence for any rise in exploitation
• Restrict vsock usage where loopback is not required