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CVE-2026-64368 is an incomplete memory-initialization vulnerability in the Linux kernel slab allocator. When allocation zeroing is requested, kmalloc() generally must zero the entire allocated object, even if the requested size is smaller, to preserve krealloc()'s __GFP_ZERO guarantees. An imprecise check instead limits zeroing to the requested size when SLAB_RED_ZONE is enabled without SLAB_STORE_USER, despite requested-size tracking being unavailable. Subsequent reallocation can therefore violate the expected zero-initialization guarantees. The fix uses slub_debug_orig_size() to determine whether the requested size is actually tracked.
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A Linux kernel slab allocator flaw can prevent complete zero-initialization of allocated memory when SLAB_RED_ZONE is enabled without SLAB_STORE_USER, violating krealloc()'s __GFP_ZERO guarantees. The fix uses slub_debug_orig_size() to determine whether the requested allocation size is tracked. The advisory rates the vulnerability High, with a CVSS v3 base score of 8.1, and recommends updating affected Google COS kernel packages to version 18867.528.43 or later.
A Linux kernel slab allocator vulnerability causes incomplete allocation zeroing when SLAB_RED_ZONE is enabled without SLAB_STORE_USER. An imprecise check limits zeroing to the requested allocation size even though that size is not tracked, violating krealloc()'s __GFP_ZERO guarantees. The plugin rates the vulnerability High, with a CVSS v3 base score of 8.1, and recommends updating the affected Google COS kernel packages to version 19506.299.82 or later.
A Linux kernel slab allocator flaw incorrectly limits allocation zeroing to the requested size when SLAB_RED_ZONE is enabled without SLAB_STORE_USER. This can violate krealloc()'s __GFP_ZERO guarantees. The advisory rates the vulnerability High, with a CVSS v3 base score of 8.1, and identifies fixed Google kernel packages in version 18613.675.37 or later.
A Linux kernel memory-management/slab vulnerability involving insufficient zeroing when only red zoning is enabled.
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Cross-references every affected SKU, including bundled OEM variants.
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