CVE-2022-48786

Technical Description

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

vsock: remove vsock from connected table when connect is interrupted by a signal

vsock_connect() expects that the socket could already be in the

TCP_ESTABLISHED state when the connecting task wakes up with a signal

pending. If this happens the socket will be in the connected table, and

it is not removed when the socket state is reset. In this situation it's

common for the process to retry connect(), and if the connection is

successful the socket will be added to the connected table a second

time, corrupting the list.

Prevent this by calling vsock_remove_connected() if a signal is received

while waiting for a connection. This is harmless if the socket is not in

the connected table, and if it is in the table then removing it will

prevent list corruption from a double add.

Note for backporting: this patch requires d5afa82c977e ("vsock: correct

removal of socket from the list"), which is in all current stable trees

exc

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References