Vulnerability in Linux

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund18 Oct 2026WID-SEC-2026-4019

  Linux Kernel: Multiple vulnerabilities Translated from German

  CVE-2026-98866CVE-2026-98624CVE-2026-98745+326 more CVEs

[ References ]References

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