# CVE-2025-38201: netfilter: nft_set_pipapo: clamp maximum map bucket size to INT_MAX

Status: published. Published: 2025-07-04. Updated: 2026-11-05.

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nft_set_pipapo: clamp maximum map bucket size to INT_MAX

Otherwise, it is possible to hit WARN_ON_ONCE in __kvmalloc_node_noprof()
when resizing hashtable because __GFP_NOWARN is unset.

Similar to:

  b541ba7d1f5a ("netfilter: conntrack: clamp maximum hashtable size to INT_MAX")

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 3c4287f62044a90e73a561aa05fc46e62da173da; < 1fe27f97944017a9d3c5af4d6d95282bff0f1147 (affected, git); ≥ 3c4287f62044a90e73a561aa05fc46e62da173da; < 4abccfb61f422300be014b8e734c63344306f009 (affected, git); ≥ 3c4287f62044a90e73a561aa05fc46e62da173da; < 80417057ac60dd80f4816eb426e4e4a5bf696534 (affected, git); ≥ 3c4287f62044a90e73a561aa05fc46e62da173da; < df524a68d9021c1401965d610bb6e42ee5d9611e (affected, git); ≥ 3c4287f62044a90e73a561aa05fc46e62da173da; < 0ab3de047808f375a36cd345225572eb3366f3c6 (affected, git); ≥ 3c4287f62044a90e73a561aa05fc46e62da173da; < d2768016f091f8a5264076b433fd7c3fabb6eb97 (affected, git); ≥ 3c4287f62044a90e73a561aa05fc46e62da173da; < b85e3367a5716ed3662a4fe266525190d2af76df (affected, git). Source: CNA: Linux
- Linux / Linux: 5.6 (affected); ≥ 0; < 5.6 (unaffected, semver); ≥ 5.10.250; ≤ 5.10.* (unaffected, semver); ≥ 5.15.200; ≤ 5.15.* (unaffected, semver); ≥ 6.1.163; ≤ 6.1.* (unaffected, semver); ≥ 6.6.124; ≤ 6.6.* (unaffected, semver); ≥ 6.12.35; ≤ 6.12.* (unaffected, semver); ≥ 6.15.4; ≤ 6.15.* (unaffected, semver); ≥ 6.16; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.24% as of 2026-11-05; percentile 14.57%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/1fe27f97944017a9d3c5af4d6d95282bff0f1147 (CNA: Linux)

- https://git.kernel.org/stable/c/4abccfb61f422300be014b8e734c63344306f009 (CNA: Linux)

- https://git.kernel.org/stable/c/80417057ac60dd80f4816eb426e4e4a5bf696534 (CNA: Linux)

- https://git.kernel.org/stable/c/df524a68d9021c1401965d610bb6e42ee5d9611e (CNA: Linux)

- https://git.kernel.org/stable/c/0ab3de047808f375a36cd345225572eb3366f3c6 (CNA: Linux)

- https://git.kernel.org/stable/c/d2768016f091f8a5264076b433fd7c3fabb6eb97 (CNA: Linux)

- https://git.kernel.org/stable/c/b85e3367a5716ed3662a4fe266525190d2af76df (CNA: Linux)

- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (ADP: siemens-SADP)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2025-38201; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-38201; retrieved 2026-11-05; source updated Not reported

Revision: 628b8d47b04dbc18a838576f19de39004028b02ff0f6ddbdb8b94ec84b2c56fe

Canonical: https://y2.dev/cve/CVE-2025-38201

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