CVE-2026-43084

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_queue: make hash table per queue Sharing a global hash table among all queues is tempting, but it can cause crash: BUG: KASAN: slab-use-after-free in nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue] [..] nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue] nfnetlink_rcv_msg+0x46a/0x930 kmem_cache_alloc_node_noprof+0x11e/0x450 struct nf_queue_entry is freed via kfree, but parallel cpu can still encounter such an nf_queue_entry when walking the list. Alternative fix is to free the nf_queue_entry via kfree_rcu() instead, but as we have to alloc/free for each skb this will cause more mem pressure.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://git.kernel.org/stable/c/22730cb96093b5be0609063bbb1923dbecd61252 ↗
• https://git.kernel.org/stable/c/41e3652a178cb0eecd48e0e6e27fbb73a004046a ↗
• https://git.kernel.org/stable/c/9e5ebef91120d2764aefe557c3a484b6288f341f ↗
• https://git.kernel.org/stable/c/936206e3f6ff411581e615e930263d6f8b78df9d ↗