CVE-2024-42070: netfilter: nf_tables: fully validate NFT_DATA_VALUE on store to data registers

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-29 · updated 2026-10-15
Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fully validate NFT_DATA_VALUE on store to data registers register store validation for NFT_DATA_VALUE is conditional, however, the datatype is always either NFT_DATA_VALUE or NFT_DATA_VERDICT. This only requires a new helper function to infer the register type from the set datatype so this conditional check can be removed. Otherwise, pointer to chain object can be leaked through the registers.

Affected products

Linux kernel: before 3.13; from 3.14 before 4.19.317; from 4.20 before 5.4.279; from 5.5 before 5.10.221; from 5.11 before 5.15.162; from 5.16 before 6.1.97 — fixed in 3.13, 4.19.317, 5.10.221, 5.15.162, 5.4.279, 6.1.97

How to fix

Upgrade to a fixed version: Linux kernel 3.13, 4.19.317, 5.10.221, 5.15.162. Check the vendor advisory for mitigations.

References

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