CVE-2025-38678: linux kernel — Fix

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

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.8 — 6.6.117
linux	linux_kernel	6.7 — 6.12.59
linux	linux_kernel	6.13 — 6.16.2
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/3f358a66a04513311668ea4b40f5064e253d8386 https://git.kernel.org/stable/c/cf23d531a9d496863aa4c5a0e2f71f0a23f3df3c https://git.kernel.org/stable/c/cf5fb87fcdaaaafec55dcc0dc5a9e15ead343973 https://git.kernel.org/stable/c/d7615bde541f16517d6790412da6ec46fa8a4c1f

Other References

https://git.kernel.org/stable/c/0521e694d5b80899fba8695881a6349f9bc538cb https://git.kernel.org/stable/c/4681960bc0f4f8bcc782cbf2fd205f48ad314dfd https://git.kernel.org/stable/c/4ce2a0c3b8497a66cfc25fc7ca3d087258a785d2

Frequently Asked Questions

What is CVE-2025-38678? +

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 It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-38678? +

CVE-2025-38678 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-38678? +

CVE-2025-38678 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-38678? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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