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CVE-2026-53397 is a memory-leak vulnerability in the Linux kernel NFS server (nfsd) ACL SETACL request decoders for NFSv2 and NFSv3 ACL processing. The affected decoders separately parse access and default ACL data. If decoding the access ACL succeeds, ownership of an allocated POSIX ACL is transferred to the SETACL argument structure, but decoding the subsequent default ACL fails, the access ACL is not released. Because the RPC framework skips the SETACL procedure handler after a decode failure, the former cleanup paths in that handler are unreachable. The configured release callbacks released only the file handle and not the ACL fields, leaving the allocated POSIX ACL orphaned for the lifetime of the server.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel nfsd flaw that leaks a POSIX ACL when SETACL decoding fails.
A Linux kernel vulnerability addressed by the Oracle Linux patch; no flaw details are provided.
A vulnerability addressed by AlmaLinux ALSA-2026:63014 affecting listed AlmaLinux 8 kernel packages.
A vulnerability referenced by the AlmaLinux ALSA-2026:63013 security advisory for AlmaLinux 8 kernel-rt packages.
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.