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CVE-2026-31402 is a heap overflow vulnerability in the Linux kernel NFS server component, nfsd, affecting the NFSv4.0 LOCK replay cache. The flaw exists because the replay cache stores encoded operation responses in a fixed 112-byte inline buffer sized for OPEN responses, but LOCK denied responses can include a variable-length conflicting lock owner field up to 1024 bytes. When a LOCK request is denied due to a conflict with an existing lock that has a large owner string, nfsd4_encode_operation() can produce a response larger than the replay buffer, and read_bytes_from_xdr_buf() copies the full encoded response into that undersized buffer without a bounds check. This causes a slab out-of-bounds heap write of up to 944 bytes past the end of the buffer, corrupting adjacent heap memory.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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42 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel nfsd heap overflow vulnerability in the NFSv4.0 LOCK replay cache.
A Linux kernel nfsd heap overflow vulnerability in the NFSv4.0 LOCK replay cache.
A Linux kernel nfsd heap overflow vulnerability in the NFSv4.0 LOCK replay cache.
A Linux kernel nfsd heap overflow vulnerability in the NFSv4.0 LOCK replay cache.
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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.