CVE-2026-16280 in Graphics DDK
Summary
by MITRE • 07/25/2026
An integer overflow when calculating physical offsets for sparse PMRs may result in 32-bit truncation of address computations for PMRs larger than 4 GB. This can lead to incorrect GPU MMU mappings and may allow a non-privileged user to trigger access to unintended physical memory, resulting in memory corruption or information disclosure.
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Analysis
by VulDB Data Team • 07/25/2026
This vulnerability represents a critical integer overflow condition that occurs during the calculation of physical memory offsets for sparse persistent memory regions within GPU memory management systems. The flaw manifests when processing PMR (Persistent Memory Region) objects exceeding 4 gigabytes in size, where the address computation logic fails to properly handle 64-bit arithmetic operations, resulting in automatic 32-bit truncation of calculated addresses. The underlying technical mechanism involves improper handling of unsigned integer overflow conditions during memory mapping calculations, specifically affecting the GPU memory management unit's ability to correctly translate virtual addresses to physical memory locations.
The operational impact of this vulnerability extends beyond simple memory corruption, as it creates a potential information disclosure vector that allows non-privileged users to access unintended physical memory regions through carefully crafted PMR operations. This represents a significant bypass of system security boundaries since the vulnerability does not require elevated privileges to exploit, making it particularly concerning for multi-user systems where GPU resources are shared. The memory corruption aspect arises from incorrect MMU (Memory Management Unit) mappings that can cause data to be read from or written to locations other than those intended by the application or system software.
The vulnerability directly relates to CWE-190, Integer Overflow or Wraparound, and CWE-191, Integer Underflow, which are fundamental classes of memory safety issues in systems programming. From an attack framework perspective, this flaw aligns with ATT&CK technique T1059.001 for command and scripting interpreter execution and potentially T1068 for exploit development through memory corruption techniques. The exploitation pathway involves constructing PMR objects larger than 4 gigabytes and triggering the address calculation logic to demonstrate how the 32-bit truncation affects physical memory mapping, which could be leveraged by attackers to read kernel memory, corrupt data structures, or potentially execute arbitrary code within the GPU memory management context.
Effective mitigation strategies require implementing proper bounds checking in all address computation routines for PMR operations, ensuring that 64-bit arithmetic is maintained throughout the calculation process even when dealing with large memory regions. System administrators should consider applying firmware and driver updates from affected vendors, while developers must review all code paths involving memory offset calculations to prevent similar integer overflow conditions. The fix typically involves modifying the mathematical operations to either use larger integer types or implement explicit overflow detection mechanisms that prevent truncation of calculated addresses when dealing with sparse PMR objects exceeding 4 gigabyte boundaries.