CVE-2026-74912 in Graphics DDK
Summary
by MITRE • 10/30/2026
On GPU systems with the security vulnerability fix for CVE-2026-49746 applied, the mapping range of graphics buffers is limited which causes errors when the mapping outside of that range.
Integer truncation caused when mapping GPU buffer pages in the buffer’s range 0GB - 4GB, produces error and limits the functionality of the kernel mode driver.
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Analysis
by VulDB Data Team • 10/30/2026
The vulnerability identified as CVE-2026-49746 represents a critical implementation flaw within the graphics subsystem of specific GPU architectures, specifically affecting systems where security patches have been applied to address prior issues related to buffer mapping boundaries. The core technical defect stems from an integer truncation error that occurs during the process of mapping GPU buffer pages into kernel space memory addresses. When the operating system or driver attempts to map a graphics buffer located within the range of zero gigabytes to four gigabytes, the underlying code fails to correctly handle the full address width required for these mappings. This miscalculation results in truncated memory addresses that do not correspond to valid physical locations on the GPU device bus. Consequently, any attempt by applications or system processes to map buffers outside this restricted range triggers immediate operational errors because the driver cannot establish a valid communication channel with the hardware using the corrupted address pointers generated by the truncation bug.
This flaw significantly impacts the stability and functionality of the kernel mode driver responsible for managing graphics resources. The limitation imposed on the mapping range effectively restricts the usable memory space available to applications that require large buffers, such as high-resolution video editors, 3D rendering engines, or machine learning workloads that rely heavily on GPU-accelerated computation. When these applications attempt to allocate and map buffers exceeding the truncated limit, they encounter runtime failures rather than graceful error handling. This leads to application crashes, frozen graphical interfaces, or system-wide instability if the kernel mode driver fails to recover from the invalid memory access attempts triggered by the truncation. The security fix intended to harden the buffer mapping process has inadvertently introduced a regression that breaks compatibility with legitimate use cases requiring larger address spaces, highlighting the complex trade-offs between strict boundary enforcement and functional correctness in low-level system drivers.
From a classification perspective, this vulnerability aligns closely with CWE-190 Integer Overflow or Wraparound, as the root cause is the improper handling of numeric values during arithmetic operations involving memory addresses. The truncation effectively wraps around or discards higher-order bits of the address, leading to an incorrect pointer value that points to unintended or invalid memory locations. In terms of attack vectors and operational impact, this issue falls under CWE-400 Uncontrolled Resource Consumption if it leads to denial-of-service conditions through repeated crashes, though its primary manifestation is a functional defect rather than a direct exploitation vector for privilege escalation. The ATT&CK framework does not directly map this specific driver bug to a standard tactic like Initial Access or Privilege Escalation because the vulnerability primarily affects availability and functionality rather than providing an entry point for attackers. However, in scenarios where memory corruption could be induced through crafted buffer sizes, it might indirectly relate to CWE-120 Buffer Copy without Checking Size of Input if the truncation leads to writes occurring at incorrect memory locations, potentially causing data integrity issues or further instability.
Mitigation strategies must focus on both immediate workarounds and long-term code remediation. For system administrators and users affected by this issue, downgrading the GPU driver to a version prior to the application of the CVE-2026-49746 fix may restore functionality for applications requiring large buffer mappings, although this exposes the system to the original vulnerabilities that necessitated the patch in the first place. A more sustainable approach involves applying subsequent micro-updates from the GPU vendor that specifically address the integer truncation logic within the mapping routine without reverting other security controls. Developers of graphics-intensive software should also implement robust error handling and validation checks for buffer allocation sizes to detect when mappings fail due to range limitations, allowing applications to degrade gracefully or request smaller buffers instead of crashing. Furthermore, static analysis tools configured to detect integer overflow conditions in C/C++ codebases can help identify similar truncation patterns during the development phase, preventing such regressions from reaching production environments. The vendor must prioritize a patch that correctly handles 64-bit address calculations for buffer mappings while maintaining the security boundaries established by the initial fix, ensuring that legitimate high-memory workloads are supported without compromising system integrity.