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CVE-2026-52951 is a race-condition-driven memory-safety flaw in the Linux kernel drm/xe dma-buf import path. The issue arises because a buffer object can be attached to the dma-buf attachment list before the xe driver has completed full buffer-object initialization. Once attached, the exporter can invoke the invalidate_mappings callback while the associated xe buffer object is still empty, partially initialized, or already freed due to an initialization failure path. This creates two hazardous states: access to an invalid or uninitialized buffer object, and a use-after-free condition if initialization fails after attachment but before the object is safely established. Reported manifestations include NULL pointer dereference during eviction-related handling when importing from another GPU driver such as amdgpu and then triggering eviction flow. The upstream fix defers the attach operation until after the buffer object is fully set up, preventing publication of invalid internal state to dma-buf callback paths.
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