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

• Severity: high (CVSS 7.8 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: 2025-07-04 · updated 2026-10-15

Description

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")

Affected products

• Linux kernel: from 5.6 before 6.12.35; from 6.13 before 6.15.4 — fixed in 6.12.35, 6.15.4

How to fix

Upgrade to a fixed version: Linux kernel 6.12.35, 6.15.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0ab3de047808f375a36cd345225572eb3366f3c6
• https://git.kernel.org/stable/c/1fe27f97944017a9d3c5af4d6d95282bff0f1147
• https://git.kernel.org/stable/c/4abccfb61f422300be014b8e734c63344306f009
• https://git.kernel.org/stable/c/80417057ac60dd80f4816eb426e4e4a5bf696534
• https://git.kernel.org/stable/c/b85e3367a5716ed3662a4fe266525190d2af76df
• https://git.kernel.org/stable/c/d2768016f091f8a5264076b433fd7c3fabb6eb97
• https://git.kernel.org/stable/c/df524a68d9021c1401965d610bb6e42ee5d9611e
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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