CVE-2026-99122

Status: UPDATED  |  Advisory ID: CVE-2026-99122

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

vsock/vmci: validate packet source for connected sockets

vmci_transport_recv_stream_cb() looks up sockets first by the full source

and destination tuple, then by destination only in the bound table. The

fallback can select a non-listening socket without checking whether the

packet came from its stored peer.

This was reproduced with two VMCI contexts. A RST from the context not

stored in a TCP_SYN_SENT socket reset that socket after it was selected by

the destination-only lookup.

VMCI can process notification packets in bottom-half context when the

socket is not owned by user context, or defer packets to a workqueue. Use

vsock_check_source() after taking the socket lock in the bottom-half path,

and recheck after lock_sock() in the workqueue path. Listening sockets

continue to accept packets from any source.

Reply with a RST addressed from the received packet before dropping a

source that fails validation. This preserves the existing reset behavior

for bound non-listening and concurrently closed sockets without directing

the reset to a connected socket's stored peer. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References