CVE-2025-40340
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.
How to fix
- Linux Linux99428bd6123d5676209dfb1d7a8f176cc830b665, 29a3064f9c5a908aaf0b39cd6ed30374db11840d, 1cda3c755bb7770be07d75949bb0f45fb88651f6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | dd08ebf6c3525a7ea2186e636df064ea47281987 ≤ v < 99428bd6123d5676209dfb1d7a8f176cc830b665, dd08ebf6c3525a7ea2186e636df064ea47281987 ≤ v < 29a3064f9c5a908aaf0b39cd6ed30374db11840d, dd08ebf6c3525a7ea2186e636df064ea47281987 ≤ v < 1cda3c755bb7770be07d75949bb0f45fb88651f6, 6.8 | 99428bd6123d5676209dfb1d7a8f176cc830b665, 29a3064f9c5a908aaf0b39cd6ed30374db11840d, 1cda3c755bb7770be07d75949bb0f45fb88651f6 |
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