CVE-2026-97998

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

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0597f2680d666a3bcf101ac0c771ba7e50016bbd < 0234d7ca0317be0a623300e1693cd794bbfdf8afaffected
LinuxLinux0597f2680d666a3bcf101ac0c771ba7e50016bbd < 1a7a8ac9a9f0ad0d410c901cb6f233833518844caffected
LinuxLinux0597f2680d666a3bcf101ac0c771ba7e50016bbd < e2dd0f1f8c4e6334699ea6382e52f6da0c7e45ebaffected
LinuxLinux0597f2680d666a3bcf101ac0c771ba7e50016bbd < 387d744fa7e499d2c3748a4e60e02ebb24e7fb16affected
LinuxLinux2.6.14affected
LinuxLinux0 < 2.6.14unaffected
LinuxLinux6.12.111 <= 6.12.*unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2.7 <= 7.2.*unaffected
LinuxLinux7.3-rc3 <= *unaffected

Weaknesses

References