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CVE-2025-21826 – Linux Netfilter nf_tables Pipapo Width Mismatch Vulnerability

The following table lists the changes that have been made to the
CVE-2025-21826 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

    Mar. 06, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved:

    netfilter: nf_tables: reject mismatching sum of field_len with set key length

    The field length description provides the length of each separated key
    field in the concatenation, each field gets rounded up to 32-bits to
    calculate the pipapo rule width from pipapo_init(). The set key length
    provides the total size of the key aligned to 32-bits.

    Register-based arithmetics still allows for combining mismatching set
    key length and field length description, eg. set key length 10 and field
    description [ 5, 4 ] leading to pipapo width of 12.
    Added Reference https://git.kernel.org/stable/c/1b9335a8000fb70742f7db10af314104b6ace220
    Added Reference https://git.kernel.org/stable/c/2ac254343d3cf228ae0738b2615fedf85d000752
    Added Reference https://git.kernel.org/stable/c/49b7182b97bafbd5645414aff054b4a65d05823d
    Added Reference https://git.kernel.org/stable/c/82e491e085719068179ff6a5466b7387cc4bbf32
    Added Reference https://git.kernel.org/stable/c/ab50d0eff4a939d20c37721fd9766347efcdb6f6
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