High 7.8Published May 6, 2026

CVE-2026-43084netfilter: nfnetlink_queue: make hash table per queue

Updated under an hour ago (Oct 27, 2026, 7:23 AM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 371de2bef6582a3f58049b3d18e190924af9c9a0 before 22730cb96093b5be0609063bbb1923dbecd61252; 870e3e63da8e88daffe9d692a025c711658018a8 builds before 41e3652a178cb0eecd48e0e6e27fbb73a004046a; 70e2e3ce4f6841e12ec1c104fc76c0e707398ec4 builds before 9e5ebef91120d2764aefe557c3a484b6288f341f; from e19079adcd26a25d7d3e586b1837493361fdf8b6 before 936206e3f6ff411581e615e930263d6f8b78df9d	CNA record
linux linux_kernel linux:linux_kernel	from 6.12.75 before 6.12.83; from 6.18.14 before 6.18.24; from 6.19.4 before 6.19.14	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.