{"id":"CVE-2026-68103","title":"drm/amdgpu: reject mapping a reserved doorbell to a new queue","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: reject mapping a reserved doorbell to a new queue\n\nWhen creating an user-queue, the user space\nprovides a doorbell BO handle and an offset within\nthe bo to …","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 8949843762631d9d0fc526dfb61a272dca29fc6f < 1050d258c7c56066d2dcaedf8d0ef66364062adc","Linux >= 8949843762631d9d0fc526dfb61a272dca29fc6f < a609b6278bf3cde17eeee6620091465521e4b02c","Linux 6.16"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:43:48.984694Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:52:56.611Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68103","references":[{"url":"https://git.kernel.org/stable/c/1050d258c7c56066d2dcaedf8d0ef66364062adc"},{"url":"https://git.kernel.org/stable/c/a609b6278bf3cde17eeee6620091465521e4b02c"}],"tags":["cve.org"],"epss":0.00151,"epssPercentile":0.03884,"ingestedAt":"2026-10-16T17:24:46.841Z","slug":"CVE-2026-68103","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: reject mapping a reserved doorbell to a new queue\n\nWhen creating an user-queue, the user space\nprovides a doorbell BO handle and an offset within\nthe bo to obtain a doorbell.\n\nHowever current implementation using xa_store_irq()\nto store a doorbell, which allows a later queue created\nwith the same BO and offset parameters to overwrite an\nexisting queue and doorbell mapping.\n\nThis can cause problems like misrouting fence IRQ\nprocessing to a wrong queue, and mislead the cleanup\nprocess of one queue erasing the mapping of another queue.\n\nThis commit fixes this issue by replacing xa_store_irq with\nxa_insert_irq, which rejects mapping a reserved\ndoorbell to a newly created queue\n\n(cherry picked from commit 6244eae22966350db52faf9c1369d3b2ffc5de4e)\n\n## Affected\n\n- `Linux >= 8949843762631d9d0fc526dfb61a272dca29fc6f < 1050d258c7c56066d2dcaedf8d0ef66364062adc`\n- `Linux >= 8949843762631d9d0fc526dfb61a272dca29fc6f < a609b6278bf3cde17eeee6620091465521e4b02c`\n- `Linux 6.16`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}