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CVE-2025-38678 – Linux Netfilter Duplicate Device Registration Vulnerability

The following table lists the changes that have been made to the
CVE-2025-38678 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Sep. 03, 2025

    Action Type Old Value New Value
    Added 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
    Added Reference https://git.kernel.org/stable/c/cf5fb87fcdaaaafec55dcc0dc5a9e15ead343973
    Added Reference https://git.kernel.org/stable/c/d7615bde541f16517d6790412da6ec46fa8a4c1f
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