CVE-2026-98624

/// Technical description

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

netfilter: nfnetlink_queue: hold nfnl mutex in event notifier

We must serialize the release notifier and the config netlink function.

A concurrent thread can issue close() which can call the release function

while unrelated socket processes UNBIND request for same portid:

Oops: general protection fault, [..]

RIP: 0010:__instance_destroy+0x60/0x210 [nfnetlink_queue]

Call Trace:

nfqnl_recv_config+0x9b0/0xdc0 [nfnetlink_queue]

nfnetlink_rcv_msg+0x7c2/0xeb0

? __pfx_nfnetlink_rcv_msg+0x10/0x10

After this, parallel UNBIND and URELEASE events are impossible.

This change isn't nice, but its the shortest fix given instances

are not refcounted and the nfnetlink config callback drops the

rcu read lock early due to need for sleeping allocations.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References