netfilter: nfnetlink_log: cope with concurrent instance destruction

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: cope with concurrent instance destruction Instances are refcounted. However, only memory release happens on the 1 -> 0 transition; the unlink from hashes can occur with any refcount. Uncooperative userspace can force a situation where a queue is pending for destruction from netlink event while a different socket with same portid processes an UNBIND request. With right timing, this will unhash the instance again: Oops: general protection fault, [..] Call Trace: <TASK> nfulnl_recv_config+0x31a/0xd50 nfnetlink_rcv_msg+0x7c2/0xeb0

Timeline

1. Sep 25, 2026, 10:23 AM UTCCVE published
2. Oct 19, 2026, 9:12 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 0597f2680d666a3bcf101ac0c771ba7e50016bbd · fixed in c5c89beaa628d6ac527c6eb2e01b2b52eb417f59; From 0597f2680d666a3bcf101ac0c771ba7e50016bbd · fixed in 042465e7d3d3127e21f04e42c1639e2518b98915; From 0597f2680d666a3bcf101ac0c771ba7e50016bbd · fixed in 291685fc8d2e4cf75ed3a23c810883653f407f46; From 0597f2680d666a3bcf101ac0c771ba7e50016bbd · fixed in 3161186a2ff81288e9a5f35daf1911153764ecae; From 0597f2680d666a3bcf101ac0c771ba7e50016bbd · fixed in 0234d7ca0317be0a623300e1693cd794bbfdf8af; From 0597f2680d666a3bcf101ac0c771ba7e50016bbd · fixed in 1a7a8ac9a9f0ad0d410c901cb6f233833518844c; From 0597f2680d666a3bcf101ac0c771ba7e50016bbd · fixed in e2dd0f1f8c4e6334699ea6382e52f6da0c7e45eb; From 0597f2680d666a3bcf101ac0c771ba7e50016bbd · fixed in 387d744fa7e499d2c3748a4e60e02ebb24e7fb16

• Linux Linux

  2.6.14

• KernelLinux

  From 2.6.14 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53; From 6.19.0 · fixed in 7.2.7

References 8