{"id":"CVE-2026-43084","title":"netfilter: nfnetlink_queue: make hash table per queue","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_queue: make hash table per queue\n\nSharing a global hash table among all queues is tempting, but\nit can cause crash:\n\nBUG: KASAN: slab-use-after-fre…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 371de2bef6582a3f58049b3d18e190924af9c9a0 < 22730cb96093b5be0609063bbb1923dbecd61252","Linux >= 870e3e63da8e88daffe9d692a025c711658018a8 < 41e3652a178cb0eecd48e0e6e27fbb73a004046a","Linux >= 70e2e3ce4f6841e12ec1c104fc76c0e707398ec4 < 9e5ebef91120d2764aefe557c3a484b6288f341f","Linux >= e19079adcd26a25d7d3e586b1837493361fdf8b6 < 936206e3f6ff411581e615e930263d6f8b78df9d","Linux >= 6.12.75 < 6.12.83","Linux >= 6.18.14 < 6.18.24","Linux >= 6.19.4 < 6.19.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:14:29.678333Z"},"published":"2026-05-06","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:32.064Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43084","references":[{"url":"https://git.kernel.org/stable/c/22730cb96093b5be0609063bbb1923dbecd61252"},{"url":"https://git.kernel.org/stable/c/41e3652a178cb0eecd48e0e6e27fbb73a004046a"},{"url":"https://git.kernel.org/stable/c/9e5ebef91120d2764aefe557c3a484b6288f341f"},{"url":"https://git.kernel.org/stable/c/936206e3f6ff411581e615e930263d6f8b78df9d"}],"tags":["cve.org"],"epss":0.0017,"epssPercentile":0.05946,"ingestedAt":"2026-10-16T17:24:46.682Z","slug":"CVE-2026-43084","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_queue: make hash table per queue\n\nSharing a global hash table among all queues is tempting, but\nit can cause crash:\n\nBUG: KASAN: slab-use-after-free in nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue]\n[..]\n nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue]\n nfnetlink_rcv_msg+0x46a/0x930\n kmem_cache_alloc_node_noprof+0x11e/0x450\n\nstruct nf_queue_entry is freed via kfree, but parallel cpu can still\nencounter such an nf_queue_entry when walking the list.\n\nAlternative fix is to free the nf_queue_entry via kfree_rcu() instead,\nbut as we have to alloc/free for each skb this will cause more mem\npressure.\n\n## Affected\n\n- `Linux >= 371de2bef6582a3f58049b3d18e190924af9c9a0 < 22730cb96093b5be0609063bbb1923dbecd61252`\n- `Linux >= 870e3e63da8e88daffe9d692a025c711658018a8 < 41e3652a178cb0eecd48e0e6e27fbb73a004046a`\n- `Linux >= 70e2e3ce4f6841e12ec1c104fc76c0e707398ec4 < 9e5ebef91120d2764aefe557c3a484b6288f341f`\n- `Linux >= e19079adcd26a25d7d3e586b1837493361fdf8b6 < 936206e3f6ff411581e615e930263d6f8b78df9d`\n- `Linux >= 6.12.75 < 6.12.83`\n- `Linux >= 6.18.14 < 6.18.24`\n- `Linux >= 6.19.4 < 6.19.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}