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

netfilter: ipset: Fix suspicious rcu_dereference_protected()

When destroying all sets, we are either in pernet exit phase or
are executing a "destroy all sets command" from userspace. The latter
was taken into account in ip_set_dereference() (nfnetlink mutex is held),
but the former was not. The patch adds the required check to
rcu_dereference_protected() in ip_set_dereference().

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-40993
• https://git.kernel.org/stable/c/3799d02ae4208af08e81310770d8754863a246a1
• https://git.kernel.org/stable/c/3fc09e1ca854bc234e007a56e0f7431f5e2defb5
• https://git.kernel.org/stable/c/523bed6489e089dd8040e72453fb79da47b144c2
• https://git.kernel.org/stable/c/72d9611968867cc4c5509e7708b1507d692b797a
• https://git.kernel.org/stable/c/788d585e62f487bc4536d454937f737b70d39a33
• https://git.kernel.org/stable/c/8ecd06277a7664f4ef018abae3abd3451d64e7a6
• https://git.kernel.org/stable/c/94dd411c18d7fff9e411555d5c662d29416501e4