CVE-2024-53140

/// Technical description

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

netlink: terminate outstanding dump on socket close

Netlink supports iterative dumping of data. It provides the families

the following ops:

- start - (optional) kicks off the dumping process

- dump - actual dump helper, keeps getting called until it returns 0

- done - (optional) pairs with .start, can be used for cleanup

The whole process is asynchronous and the repeated calls to .dump

don't actually happen in a tight loop, but rather are triggered

in response to recvmsg() on the socket.

This gives the user full control over the dump, but also means that

the user can close the socket without getting to the end of the dump.

To make sure .start is always paired with .done we check if there

is an ongoing dump before freeing the socket, and if so call .done.

The complication is that sockets can get freed from BH and .done

is allowed to sleep. So we use a workqueue to defer the call, when

needed.

Unfortunately thi

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

/// References