What’s Vulnerable › Vulnerabilities

CVE-2026-98624: netfilter: nfnetlink_queue: hold nfnl mutex in event notifier

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-18 · updated 2026-10-19

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.

Affected products

• Linux kernel: 2.6.14 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/07a3ec8fdc5a1267c00cd6fd1cf8bbb5cda913c1
• https://git.kernel.org/stable/c/1d1184411599a7c2217560bab3bbe641c6d03b95
• https://git.kernel.org/stable/c/2e9be1302f25c9be51c2fb8c907bc6d8a1050e33
• https://git.kernel.org/stable/c/46432f2e76f7c385d82506304a2928e7d293289f
• https://git.kernel.org/stable/c/597320337c3da06c92a9e95cfc755da66fedc476
• https://git.kernel.org/stable/c/8137a39e08e838ced234044384740ceeb99ed388
• https://git.kernel.org/stable/c/9461613afc59acef44a0071b0dd5075f6e993ffe
• https://git.kernel.org/stable/c/d559e06a5ab7c064100aafd5c826eadd0f1c6216

Get alerted when CVE-2026-98624 or the next vulnerability affects your stack