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.
Fix
Microsoft's update · Moderate
- Release Notes — azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 · build 6.6.159.1-1
From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-11-01.
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 2
- StatusReceived → PublishedNVD modified 2026-10-19 09:22
- First seenunscoredNVD modified 2026-10-19 10:19
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 8
- 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