Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: reject duplicate device on updates A chain/flowtable update with duplicated devices in the same batch is possible. Unfortunately, netdev event path only removes the first device that is found, leaving unregistered the hook of the duplicated device. Check if a duplicated device exists in the transaction batch, bail out with EEXIST in such case. WARNING is hit when unregistering the hook: [49042.221275] WARNING: CPU: 4 PID: 8425 at net/netfilter/core.c:340 nf_hook_entry_head+0xaa/0x150 [49042.221375] CPU: 4 UID: 0 PID: 8425 Comm: nft Tainted: G S 6.16.0+ #170 PREEMPT(full) [...] [49042.221382] RIP: 0010:nf_hook_entry_head+0xaa/0x150
Affected products
linux: linux kernel
References7
- git.kernel.org/stable/c/3f358a66a04513311668ea4b40f5064e253d8386 Patch
- git.kernel.org/stable/c/cf23d531a9d496863aa4c5a0e2f71f0a23f3df3c Patch
- git.kernel.org/stable/c/cf5fb87fcdaaaafec55dcc0dc5a9e15ead343973 Patch
- git.kernel.org/stable/c/d7615bde541f16517d6790412da6ec46fa8a4c1f Patch
- git.kernel.org/stable/c/0521e694d5b80899fba8695881a6349f9bc538cb
- git.kernel.org/stable/c/4681960bc0f4f8bcc782cbf2fd205f48ad314dfd
- git.kernel.org/stable/c/4ce2a0c3b8497a66cfc25fc7ca3d087258a785d2
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 22 · as of 8 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.