{"id":"CVE-2026-68103","summary":"drm/amdgpu: reject mapping a reserved doorbell to a new queue","details":"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 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)","modified":"2026-08-18T03:31:13.189997023Z","published":"2026-08-10T11:58:19.317Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68103.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1050d258c7c56066d2dcaedf8d0ef66364062adc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a609b6278bf3cde17eeee6620091465521e4b02c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68103.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68103"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8949843762631d9d0fc526dfb61a272dca29fc6f"},{"fixed":"1050d258c7c56066d2dcaedf8d0ef66364062adc"},{"fixed":"a609b6278bf3cde17eeee6620091465521e4b02c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68103.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.16.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68103.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"}]}