What’s Vulnerable › Vulnerabilities

CVE-2025-38120: netfilter: nf_set_pipapo_avx2: fix initial map fill

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-03 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_set_pipapo_avx2: fix initial map fill If the first field doesn't cover the entire start map, then we must zero out the remainder, else we leak those bits into the next match round map. The early fix was incomplete and did only fix up the generic C implementation. A followup patch adds a test case to nft_concat_range.sh.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 5.15.165 before 5.15.186; from 6.1.103 before 6.1.142; from 6.6.44 before 6.6.94; from 6.10.3 before 6.12.34; from 6.13 before 6.15.3 — fixed in 5.15.186, 6.1.142, 6.12.34, 6.15.3, 6.6.94

How to fix

Upgrade to a fixed version: Linux kernel 5.15.186, 6.1.142, 6.12.34, 6.15.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/251496ce1728c9fd47bd2b20a7b21b20b9a020ca
• https://git.kernel.org/stable/c/39bab2d3517b5b50c609b4f8c66129bf619fffa0
• https://git.kernel.org/stable/c/8068e1e42b46518ce680dc6470bcd710efc3fa0a
• https://git.kernel.org/stable/c/8164d0efaf370c425dc69a1e8216940d09e7de0c
• https://git.kernel.org/stable/c/90bc7f5a244aadee4292b28098b7c98aadd4b3aa
• https://git.kernel.org/stable/c/b5ad58285f9217d68cd5ea2ad86ce254a3fe7c4d
• https://git.kernel.org/stable/c/ea77c397bff8b6d59f6d83dae1425b08f465e8b5
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html

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