{"id":"CVE-2026-23412","title":"netfilter: bpf: defer hook memory release until rcu readers are done","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bpf: defer hook memory release until rcu readers are done\n\nYiming Qian reports UaF when concurrent process is dumping hooks via\nnfnetlink_hooks:\n\nBUG: KASAN:…","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 >= 84601d6ee68ae820dec97450934797046d62db4b < d016c216bc75c45128160593a77b864a04dbe7c0","Linux >= 84601d6ee68ae820dec97450934797046d62db4b < cb2bf5efdb02a2a59faf603604a1066e8266f349","Linux >= 84601d6ee68ae820dec97450934797046d62db4b < c25e0dec366ae99b7264324ce3c7cbaea34691f9","Linux >= 84601d6ee68ae820dec97450934797046d62db4b < 54244d54a971c26a0cd0a9073460ff71f3c51b32","Linux >= 84601d6ee68ae820dec97450934797046d62db4b < 24f90fa3994b992d1a09003a3db2599330a5232a","Linux 6.4"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:07:44.417268Z"},"published":"2026-04-02","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:09:55.129Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23412","references":[{"url":"https://git.kernel.org/stable/c/d016c216bc75c45128160593a77b864a04dbe7c0"},{"url":"https://git.kernel.org/stable/c/cb2bf5efdb02a2a59faf603604a1066e8266f349"},{"url":"https://git.kernel.org/stable/c/c25e0dec366ae99b7264324ce3c7cbaea34691f9"},{"url":"https://git.kernel.org/stable/c/54244d54a971c26a0cd0a9073460ff71f3c51b32"},{"url":"https://git.kernel.org/stable/c/24f90fa3994b992d1a09003a3db2599330a5232a"}],"tags":["cve.org"],"epss":0.00117,"epssPercentile":0.01544,"ingestedAt":"2026-10-16T17:24:46.644Z","slug":"CVE-2026-23412","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bpf: defer hook memory release until rcu readers are done\n\nYiming Qian reports UaF when concurrent process is dumping hooks via\nnfnetlink_hooks:\n\nBUG: KASAN: slab-use-after-free in nfnl_hook_dump_one.isra.0+0xe71/0x10f0\nRead of size 8 at addr ffff888003edbf88 by task poc/79\nCall Trace:\n <TASK>\n nfnl_hook_dump_one.isra.0+0xe71/0x10f0\n netlink_dump+0x554/0x12b0\n nfnl_hook_get+0x176/0x230\n [..]\n\nDefer release until after concurrent readers have completed.\n\n## Affected\n\n- `Linux >= 84601d6ee68ae820dec97450934797046d62db4b < d016c216bc75c45128160593a77b864a04dbe7c0`\n- `Linux >= 84601d6ee68ae820dec97450934797046d62db4b < cb2bf5efdb02a2a59faf603604a1066e8266f349`\n- `Linux >= 84601d6ee68ae820dec97450934797046d62db4b < c25e0dec366ae99b7264324ce3c7cbaea34691f9`\n- `Linux >= 84601d6ee68ae820dec97450934797046d62db4b < 54244d54a971c26a0cd0a9073460ff71f3c51b32`\n- `Linux >= 84601d6ee68ae820dec97450934797046d62db4b < 24f90fa3994b992d1a09003a3db2599330a5232a`\n- `Linux 6.4`\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":[]}