CVE-2026-49744 in Graphics DDK
Summary
by MITRE • 07/24/2026
Kernel software installed and running inside a Guest VM may post improper commands to the GPU Firmware to trigger a write of data outside the Guest's virtualised GPU memory.
Out of bounds accesses triggered by malware introduced to a Guest KMD could allow privilege escalation which escapes virtualization boundaries.
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Analysis
by VulDB Data Team • 07/24/2026
This vulnerability represents a critical hypervisor escape mechanism that exploits the trust relationship between guest operating systems and virtualized hardware components. The flaw occurs when kernel-mode drivers within a guest virtual machine execute improper commands against GPU firmware, resulting in unauthorized memory writes beyond the designated virtualized GPU memory boundaries. This type of vulnerability falls under the CWE-787 Out-of-bounds Write category, specifically manifesting as a privilege escalation vector that undermines fundamental virtualization security assumptions.
The technical implementation involves improper command validation within the guest kernel-mode driver component responsible for GPU communication. When malware executes malicious code within the guest environment, it can manipulate the GPU firmware through improperly validated commands, causing data to be written to memory locations outside the designated virtualized GPU memory space. This creates a direct pathway for privilege escalation where unprivileged guest processes can potentially access or modify memory regions that should remain isolated from guest execution contexts.
The operational impact of this vulnerability extends beyond traditional malware execution, as it enables attackers to escape virtualization boundaries and potentially gain access to other virtual machines or the host system itself. According to ATT&CK framework, this represents a technique for privilege escalation under tactic TA0004 and may involve T1068 for local privilege escalation. The vulnerability essentially creates a backdoor through which malicious actors can bypass hypervisor isolation controls that are supposed to maintain separation between virtualized environments.
Mitigation strategies must address both the immediate security gap and the underlying architectural assumptions about guest-to-hypervisor communication. Organizations should implement strict command validation mechanisms within GPU firmware interfaces, enforce memory access controls at the hypervisor level, and deploy runtime monitoring solutions capable of detecting unauthorized memory write operations. Additionally, virtual machine isolation should be strengthened through hardware-assisted virtualization features such as Intel VT-d or AMD-Vi to prevent improper GPU command execution from affecting system memory boundaries. The vulnerability highlights the importance of maintaining strict security boundaries even within trusted guest environments where kernel-mode drivers have elevated privileges and direct hardware access capabilities.