CVE-2026-64368
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
In the Linux kernel's mm/slab subsystem, a bug was found in the memory zeroing mechanism during allocation. When only red zoning (SLAB_RED_ZONE) is enabled without tracking the requested size (SLAB_STORE_USER), kmalloc may zero only the requested size instead of the full object, breaking the __GFP_ZERO guarantees for krealloc.
Risk Assessment
The organization may experience sensitive data leakage because krealloc can return memory containing unzeroed data from previous allocations, posing a confidentiality risk.
Recommendation
It is recommended to immediately update the Linux kernel to a version containing the fix, which uses slub_debug_orig_size() instead of the imprecise condition.
Other vulnerabilities in Linux kernel
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- CVE-2026-80542Unknown
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- CVE-2026-80535Unknown
In the Linux kernel XFS filesystem, during directory tree repair, a self-referential directory may be detected. In such a case, the repair code attempts to lock the same inode twice (double iolock/ilock), leading to a deadlock. The fix detects this corner case and handles it appropriately.
- CVE-2026-80533Unknown
In the Linux kernel XFS filesystem, during AGI repair, the function xrep_iunlink_walk_ondisk_bucket may attempt to use the pointer sc->sa.agi_bp, which can be null if the buffer verifier fails. The fix uses ragi->agi_bp instead, which skips verifier checks, to avoid walking off the end of memory.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: mm/slab: do not limit zeroing to orig_size when only red zoning is enabled When init (zeroing) on allocation is requested, for kmalloc() we generally have to zero the full object size even if a smaller size is requested, in order to provide krealloc()'s __GFP_ZERO guarantees. But if we track the requested size, krealloc() uses that information to do the right thing, so we can zero only the requested size. With red zoning also enabled, any extra size became part of the red zone, so it must not be zeroed and thus we must zero only the requested size. However the current check is imprecise, and will trigger also when only SLAB_RED_ZONE is enabled without SLAB_STORE_USER (which enables tracking the requested size). This means enabling red zoning alone can compromise krealloc()'s __GFP_ZERO contract. Fix this by using slub_debug_orig_size() instead, which is the exact check for whether the requested size is tracked. We don't need to care if red zoning is also enabled or not. Also update and expand the comment accordingly.