CVE-2026-68265 in Linux
Summary
by MITRE • 08/10/2026
In the Linux kernel, the following vulnerability has been resolved:
drm/xe/vm: Fix BO prefetch with CONSULT_MEM_ADVISE_PREF_LOC
When prefetch region is DRM_XE_CONSULT_MEM_ADVISE_PREF_LOC for a BO VMA, the code used it as an index into region_to_mem_type[], causing an
out-of-bounds access since the value is -1.
Resolve the preferred location for BO VMAs directly: local VRAM on dGFX (using the BO's tile placement) or system memory on iGPU.
Discovered using AI-assisted static analysis confirmed by Intel Product Security.
v2: -Fix null dereference
(cherry picked from commit d9a4906ac03be9f6ed3f3b45c56c866b867fd75b)
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Analysis
by VulDB Data Team • 08/10/2026
The vulnerability resides within the Intel graphics driver implementation in the Linux kernel, specifically affecting the display render module's virtual memory management subsystem. This issue impacts the xe driver which handles Intel graphics hardware including both discrete graphics (dGFX) and integrated graphics (iGPU) configurations. The flaw manifests when processing buffer object prefetch operations where the system attempts to determine optimal memory placement for graphics buffers. The root cause stems from improper handling of memory advisory hints, particularly when the preferred memory location is indicated as DRM_XE_CONSULT_MEM_ADVISE_PREF_LOC which has a value of -1.
The technical implementation error occurs in the region_to_mem_type[] array indexing mechanism where the system treats the -1 value as a valid array index. This creates an out-of-bounds memory access condition that can lead to unpredictable behavior including potential system crashes or privilege escalation opportunities. The vulnerability represents a classic buffer overflow scenario where invalid input data is used for array indexing operations without proper validation checks. This flaw falls under CWE-129 Input Validation and CWE-787 Out-of-bounds Write categories, as the system fails to validate that the memory advisory hint value falls within acceptable bounds before using it as an array index.
The operational impact of this vulnerability extends across various Intel graphics configurations where the xe driver manages graphics buffer allocation and memory placement decisions. Systems utilizing discrete graphics with local VRAM or integrated graphics relying on system memory could potentially be affected depending on how prefetch operations are handled during graphics workload execution. The null dereference fix in v2 indicates that additional instability conditions may have existed beyond just the out-of-bounds access, suggesting this vulnerability could have enabled more severe system compromise scenarios.
Mitigation strategies should focus on ensuring proper input validation before array indexing operations and implementing robust error handling for memory advisory hint processing. System administrators should ensure kernel updates are applied promptly to address this vulnerability, particularly in environments where graphics-intensive applications are deployed. The fix implemented resolves the issue by directly determining preferred memory locations based on hardware capabilities rather than relying on potentially invalid advisory hints. This approach aligns with ATT&CK technique T1068 for privilege escalation and T1547 for system modification, as proper validation prevents unauthorized access to memory resources that could be leveraged for privilege elevation.
The vulnerability discovery through AI-assisted static analysis demonstrates modern security research methodologies that can identify subtle memory management flaws before they can be exploited in the wild. This proactive approach to vulnerability identification represents industry best practices for maintaining secure graphics driver implementations and aligns with security frameworks emphasizing automated code analysis for identifying potential attack vectors. The fix maintains proper memory placement decisions based on hardware characteristics while eliminating the dangerous array indexing operation that led to the out-of-bounds access condition, ensuring more robust and predictable behavior across different Intel graphics configurations.