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CVE-2025-39902 is an invalid pointer access vulnerability in the Linux kernel SLUB allocator's object_err() debugging function. The function accesses object metadata, including freelist pointers and redzone information, without first ensuring that the object pointer is valid. A known failure path occurs when alloc_consistency_checks() detects an invalid allocated-object pointer resulting from freelist corruption and invokes object_err() to report the problem. Accessing metadata through that pointer can crash the kernel during error reporting. The fix skips metadata access when the pointer is NULL or fails check_valid_pointer(), printing only the pointer value.
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21 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel SLUB debugging flaw allows invalid-pointer access in object_err() to cause a crash while reporting memory corruption. The advisory assigns CVSS v3 severity of 5.5, indicating local access, low privileges, and high availability impact. The fix skips metadata access when the pointer is NULL or fails validation.
A vulnerability addressed by the Miracle Linux AXSA-2026-1750 kernel-related package update; the technical flaw details are not provided.
A vulnerability referenced as part of an Oracle Linux ELSA-2026-55764 kernel-related security update.
A Linux kernel SLUB allocator debugging flaw where object_err() may access object metadata even when the object pointer is invalid, potentially causing a crash instead of gracefully reporting freelist corruption or invalid pointers.
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.