VulnerabilityPublished 4 Jul 2025Updated 5 Nov 2026

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

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in df524a68d9021c1401965d610bb6e42ee5d9611e : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:04 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch

Available – fixed in df524a68d9021c1401965d610bb6e42ee5d9611e, d2768016f091f8a5264076b433fd7c3fabb6eb97, b85e3367a5716ed3662a4fe266525190d2af76df +4

Exploitation evidence

Disclosed: evidence found.
CVE published 4 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 3c4287f62044a90e73a561aa05fc46e62da173da, < df524a68d9021c1401965d610bb6e42ee5d9611e	Fixed in df524a68d9021c1401965d610bb6e42ee5d9611e
LinuxLinux	Affected ≥ 3c4287f62044a90e73a561aa05fc46e62da173da, < d2768016f091f8a5264076b433fd7c3fabb6eb97	Fixed in d2768016f091f8a5264076b433fd7c3fabb6eb97
LinuxLinux	Affected ≥ 3c4287f62044a90e73a561aa05fc46e62da173da, < b85e3367a5716ed3662a4fe266525190d2af76df	Fixed in b85e3367a5716ed3662a4fe266525190d2af76df
LinuxLinux	Affected ≥ 3c4287f62044a90e73a561aa05fc46e62da173da, < 80417057ac60dd80f4816eb426e4e4a5bf696534	Fixed in 80417057ac60dd80f4816eb426e4e4a5bf696534
LinuxLinux	Affected ≥ 3c4287f62044a90e73a561aa05fc46e62da173da, < 4abccfb61f422300be014b8e734c63344306f009	Fixed in 4abccfb61f422300be014b8e734c63344306f009
LinuxLinux	Affected ≥ 3c4287f62044a90e73a561aa05fc46e62da173da, < 1fe27f97944017a9d3c5af4d6d95282bff0f1147	Fixed in 1fe27f97944017a9d3c5af4d6d95282bff0f1147

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")

References

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