Memory Management Vulnerability in Linux Kernel Affecting Metadata Access
CVE-2025-39902
What is CVE-2025-39902?
A vulnerability has been identified in the Linux kernel related to the memory management component, specifically within the mm/slub subsystem. This issue arises when an invalid pointer is accessed in the object_err() function meant for debugging. If this pointer does not point to a valid object, it can lead to unexpected crashes. A known trigger for this crash occurs during calls to alloc_consistency_checks(), where a corrupted freelist leads to an invalid pointer being reported by object_err(). The resolution involves ensuring that any checks against pointer validity are strictly adhered to, allowing only valid accesses to metadata. Should a pointer be NULL or deemed invalid, the system should only log the pointer value without attempting to access the potentially corrupted metadata, thus enhancing overall system stability.
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Affected Version(s)
Linux 81819f0fc8285a2a5a921c019e3e3d7b6169d225 < 872f2c34ff232af1e65ad2df86d61163c8ffad42
Linux 81819f0fc8285a2a5a921c019e3e3d7b6169d225
Linux 81819f0fc8285a2a5a921c019e3e3d7b6169d225 < 7e287256904ee796c9477e3ec92b07f236481ef3