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CVE-2026-31402 is a heap-buffer overflow in the Linux kernel NFS server's NFSv4.0 LOCK replay cache. The cache uses a fixed 112-byte inline buffer sized for OPEN responses, but denied LOCK responses can contain a conflicting lock-owner identifier of up to 1,024 bytes. The nfsd4_encode_operation() function copies the encoded response into this buffer through read_bytes_from_xdr_buf() without checking its length, allowing a slab-out-of-bounds write of up to 944 bytes. An unauthenticated remote attacker using two cooperating NFSv4.0 clients can trigger the overflow by establishing a lock with a large owner string and requesting a conflicting lock.
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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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58 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A heap buffer overflow in the Linux kernel's NFSv4.0 server replay cache. Encoded LOCK denial responses are copied into an undersized buffer without bounds checking, corrupting adjacent heap memory. The description states that an unauthenticated remote attacker can trigger the flaw using two cooperating NFSv4.0 clients. The fix checks response length and skips caching oversized payloads. The plugin's CVSS v3 vector describes local, low-privilege access, which conflicts with the remote unauthenticated attack described in its vulnerability text.
A Linux kernel NFSD heap-overflow vulnerability in NFSv4.0 LOCK replay-cache handling. An oversized encoded LOCK-denied response can overflow the fixed replay buffer and corrupt adjacent heap memory; the content states it can be remotely triggered by unauthenticated cooperating NFSv4.0 clients.
A vulnerability addressed by the referenced CentOS Stream 8 TuxCare security update; no technical details are provided.
A vulnerability addressed by the Ubuntu USN-8667-1 kernel security update.
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.