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CVE-2025-39902 is a Linux kernel flaw in the SLUB allocator debugging path within mm/slub. The issue is in object_err(), a diagnostic routine that reports object details such as freelist and redzone metadata. When object_err() is invoked with an invalid pointer, it may still attempt to access object metadata even though the pointer does not reference a valid SLUB object. This can occur during corruption handling, including a documented path where alloc_consistency_checks() detects an invalid allocated-object pointer caused by freelist corruption and then calls object_err() for reporting. Instead of handling the corruption gracefully, the debug path can dereference invalid memory and crash the kernel. The fix changes object_err() so that when the pointer is NULL or fails pointer validation, it prints only the pointer value and skips metadata access.
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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.
A Linux kernel mm/slub flaw involving access to metadata when a pointer is invalid in object_err().
A Linux kernel mm/slub flaw involving invalid pointer handling in object_err().
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.