CVE-2024-40942

Technical Description

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

wifi: mac80211: mesh: Fix leak of mesh_preq_queue objects

The hwmp code use objects of type mesh_preq_queue, added to a list in

ieee80211_if_mesh, to keep track of mpath we need to resolve. If the mpath

gets deleted, ex mesh interface is removed, the entries in that list will

never get cleaned. Fix this by flushing all corresponding items of the

preq_queue in mesh_path_flush_pending().

This should take care of KASAN reports like this:

unreferenced object 0xffff00000668d800 (size 128):

comm "kworker/u8:4", pid 67, jiffies 4295419552 (age 1836.444s)

hex dump (first 32 bytes):

00 1f 05 09 00 00 ff ff 00 d5 68 06 00 00 ff ff ..........h.....

8e 97 ea eb 3e b8 01 00 00 00 00 00 00 00 00 00 ....>...........

backtrace:

[<000000007302a0b6>] __kmem_cache_alloc_node+0x1e0/0x35c

[<00000000049bd418>] kmalloc_trace+0x34/0x80

[<0000000000d792bb>] mesh_queue_preq+0x44/0x2a8

[<00000000c99c3696>] mes

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