CVE-2026-43451

Summary

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

netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path

nfqnl_recv_verdict() calls find_dequeue_entry() to remove the queue entry from the queue data structures, taking ownership of the entry. For PF_BRIDGE packets, it then calls nfqa_parse_bridge() to parse VLAN attributes. If nfqa_parse_bridge() returns an error (e.g. NFQA_VLAN present but NFQA_VLAN_TCI missing), the function returns immediately without freeing the dequeued entry or its sk_buff.

This leaks the nf_queue_entry, its associated sk_buff, and all held references (net_device refcounts, struct net refcount). Repeated triggering exhausts kernel memory.

Fix this by dropping the entry via nfqnl_reinject() with NF_DROP verdict on the error path, consistent with other error handling in this file.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794
• https://git.kernel.org/stable/c/0b18d1b834ab5a5009be70b530f978d7989e445b
• https://git.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97b
• https://git.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982
• https://git.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032f
• https://git.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41
• https://git.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275
• https://git.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9

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