What’s Vulnerable › Vulnerabilities

CVE-2022-50001: netfilter: nft_tproxy: restrict to prerouting hook

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-18 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_tproxy: restrict to prerouting hook TPROXY is only allowed from prerouting, but nft_tproxy doesn't check this. This fixes a crash (null dereference) when using tproxy from e.g. output.

Affected products

• Linux kernel: from 4.19 before 4.19.273; from 4.20 before 5.4.232; from 5.5 before 5.10.169; from 5.11 before 5.15.95; from 5.16 before 5.19.6; 6.0-rc1, 6.0-rc2 — fixed in 4.19.273, 5.10.169, 5.15.95, 5.19.6, 5.4.232

How to fix

Upgrade to a fixed version: Linux kernel 4.19.273, 5.10.169, 5.15.95, 5.19.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0b21edf4cc13516716848e0a4fdf726aa2a62cd9
• https://git.kernel.org/stable/c/18bbc3213383a82b05383827f4b1b882e3f0a5a5
• https://git.kernel.org/stable/c/343fed6b0daeb528ae5c9d4d84d9ff763ac95619
• https://git.kernel.org/stable/c/83ef55c4281f1b4c6bd4457c2e96ccd1c9e80200
• https://git.kernel.org/stable/c/9a1d92cbeac3335fee99fa865b8c5b0f2e71a8f7
• https://git.kernel.org/stable/c/eaba3f9b672c3a3f820da8ee9584b9520674eafa

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