CVE-2026-23412 PUBLISHED

netfilter: bpf: defer hook memory release until rcu readers are done

Assigner: Linux
Reserved: 13.01.2026 Published: 02.04.2026 Updated: 02.04.2026

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

netfilter: bpf: defer hook memory release until rcu readers are done

Yiming Qian reports UaF when concurrent process is dumping hooks via nfnetlink_hooks:

BUG: KASAN: slab-use-after-free in nfnl_hook_dump_one.isra.0+0xe71/0x10f0 Read of size 8 at addr ffff888003edbf88 by task poc/79 Call Trace: <TASK> nfnl_hook_dump_one.isra.0+0xe71/0x10f0 netlink_dump+0x554/0x12b0 nfnl_hook_get+0x176/0x230 [..]

Defer release until after concurrent readers have completed.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 84601d6ee68ae820dec97450934797046d62db4b to d016c216bc75c45128160593a77b864a04dbe7c0 (excl.)
  • affected from 84601d6ee68ae820dec97450934797046d62db4b to cb2bf5efdb02a2a59faf603604a1066e8266f349 (excl.)
  • affected from 84601d6ee68ae820dec97450934797046d62db4b to c25e0dec366ae99b7264324ce3c7cbaea34691f9 (excl.)
  • affected from 84601d6ee68ae820dec97450934797046d62db4b to 54244d54a971c26a0cd0a9073460ff71f3c51b32 (excl.)
  • affected from 84601d6ee68ae820dec97450934797046d62db4b to 24f90fa3994b992d1a09003a3db2599330a5232a (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.4 is affected
  • unaffected from 0 to 6.4 (excl.)
  • unaffected from 6.6.130 to 6.6.* (incl.)
  • unaffected from 6.12.78 to 6.12.* (incl.)
  • unaffected from 6.18.20 to 6.18.* (incl.)
  • unaffected from 6.19.10 to 6.19.* (incl.)
  • unaffected from 7.0-rc5 to * (incl.)

References