CVE-2025-40340 - Xe Linux DRM Oops in Gem Fault

CVE-2025-40340 - Xe Linux DRM Oops in Gem Fault

https://cvefeed.io/rssfeed/latest.atom / Tue, 12/09/2025 - 10:52
CVE ID : CVE-2025-40340
Published : Dec. 9, 2025, 6:28 a.m. | 1 hour, 46 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: drm/xe: Fix oops in xe_gem_fault when running core_hotunplug test. I saw an oops in xe_gem_fault when running the xe-fast-feedback testlist against the realtime kernel without debug options enabled. The panic happens after core_hotunplug unbind-rebind finishes. Presumably what happens is that a process mmaps, unlocks because of the FAULT_FLAG_RETRY_NOWAIT logic, has no process memory left, causing ttm_bo_vm_dummy_page() to return VM_FAULT_NOPAGE, since there was nothing left to populate, and then oopses in "mem_type_is_vram(tbo->resource->mem_type)" because tbo->resource is NULL. It's convoluted, but fits the data and explains the oops after the test exits.
Severity: 0.0 | NA
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