CVE-2024-41006

/// Technical description

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

netrom: Fix a memory leak in nr_heartbeat_expiry()

syzbot reported a memory leak in nr_create() [0].

Commit 409db27e3a2e ("netrom: Fix use-after-free of a listening socket.")

added sock_hold() to the nr_heartbeat_expiry() function, where

a) a socket has a SOCK_DESTROY flag or

b) a listening socket has a SOCK_DEAD flag.

But in the case "a," when the SOCK_DESTROY flag is set, the file descriptor

has already been closed and the nr_release() function has been called.

So it makes no sense to hold the reference count because no one will

call another nr_destroy_socket() and put it as in the case "b."

nr_connect

nr_establish_data_link

nr_start_heartbeat

nr_release

switch (nr->state)

case NR_STATE_3

nr->state = NR_STATE_2

sock_set_flag(sk, SOCK_DESTROY);

nr_rx_frame

nr_process_rx_frame

switch (nr->state)

/// 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