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CVE-2025-38201 is a Linux kernel vulnerability in the netfilter nftables pipapo set implementation (nft_set_pipapo). The issue occurs during hashtable resizing when the maximum map bucket size is not clamped, allowing sizing/allocation behavior that can exceed safe integer bounds for the allocation path. As described in the fix, the vulnerability is resolved by clamping the maximum map bucket size to INT_MAX. Without this bound, the kernel can hit WARN_ON_ONCE in __kvmalloc_node_noprof() because __GFP_NOWARN is unset during the problematic allocation path. Based on the available vendor context, this is primarily an availability issue in kernel memory allocation/resizing logic rather than a demonstrated code-execution flaw.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.