CVE-2026-68103
Description
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: reject mapping a reserved doorbell to a new queue When creating an user-queue, the user space provides a doorbell BO handle and an offset within the bo to obtain a doorbell. However current implementation using xa_store_irq() to store a doorbell, which allows a later queue created with the same BO and offset parameters to overwrite an existing queue and doorbell mapping. This can cause problems like misrouting fence IRQ processing to a wrong queue, and mislead the cleanup process of one queue erasing the mapping of another queue. This commit fixes this issue by replacing xa_store_irq with xa_insert_irq, which rejects mapping a reserved doorbell to a newly created queue (cherry picked from commit 6244eae22966350db52faf9c1369d3b2ffc5de4e)
How to fix
- Linux Linux1050d258c7c56066d2dcaedf8d0ef66364062adc, a609b6278bf3cde17eeee6620091465521e4b02c or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 8949843762631d9d0fc526dfb61a272dca29fc6f ≤ v < 1050d258c7c56066d2dcaedf8d0ef66364062adc, 8949843762631d9d0fc526dfb61a272dca29fc6f ≤ v < a609b6278bf3cde17eeee6620091465521e4b02c, 6.16 | 1050d258c7c56066d2dcaedf8d0ef66364062adc, a609b6278bf3cde17eeee6620091465521e4b02c |
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