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CVE-2026-64368 is a flaw in the Linux kernel mm/slab allocator logic affecting zero-initialized kmalloc() allocations under certain SLUB debugging configurations. When allocation-time zeroing is requested, kmalloc() normally must zero the full backing object size to preserve krealloc() semantics for __GFP_ZERO. If the allocator is tracking the originally requested allocation size, krealloc() can safely rely on that metadata and only the requested size needs to be zeroed. The vulnerable logic used an imprecise condition that treated red-zoning as sufficient to limit zeroing to the original requested size even when the requested size was not actually being tracked. As a result, systems with SLAB_RED_ZONE enabled without SLAB_STORE_USER could perform incomplete initialization of the allocated object, violating the expected __GFP_ZERO behavior. The fix replaces the imprecise check with slub_debug_orig_size(), which accurately determines whether original-size tracking is present before limiting zeroing.
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A Linux kernel SLUB/mm/slab vulnerability where imprecise handling of zeroing during allocation when red zoning is enabled can break krealloc()'s __GFP_ZERO guarantees.
A Linux kernel mm/slab vulnerability addressed in this Red Hat kernel security advisory.
A Linux kernel mm/slab vulnerability related to incorrect zeroing behavior when only red zoning is enabled.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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