{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68103", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.368Z", "datePublished": "2026-08-10T11:58:19.317Z", "dateUpdated": "2026-10-19T20:58:50.510Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:58:51.492Z" }, "descriptions": [ { "lang": "en", "value": "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)" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached only through the AMDGPU DRM_USERQ ioctl on a local render node (/dev/dri/renderD*); fence IRQ handling is driven by local GPU completion events, not remote network input.\nAC:L - An attacker can deterministically trigger the overwrite by issuing AMDGPU_USERQ_OP_CREATE with the same doorbell GEM handle and offset (same process) or by landing on the same global doorbell BAR index (shared-GPU hosts); no race or victim timing is required.\nPR:L - Exploitation requires only access to the AMDGPU render node granted to normal local users (e.g., render/video group on workstations, cloud GPU VMs, ROCm compute nodes); high-priority queue creation is optional and not needed for the attack.\nUI:N - The attacker triggers the flaw directly via ioctls; victims need only be running ordinary GPU compute/graphics workloads on the same device, with no additional user interaction.\nS:U - Impact is confined to kernel AMDGPU user-queue and fence state on the local GPU; it does not cross VM, IOMMU, or sandbox boundaries into another security authority.\nC:N - Misrouting fence IRQs corrupts queue-to-doorbell associations and synchronization but provides no kernel or victim memory read primitive; AMDGPU per-process VM isolation blocks direct disclosure of another tenant's GPU buffers.\nI:H - Silently overwriting the device-global doorbell xarray lets an attacker hijack another queue's fence IRQ handling and erase its mapping on teardown, corrupting kernel queue state and breaking GPU synchronization integrity for other workloads.\nA:H - Orphaned queues stop receiving fence IRQs, provoking hang detection and amdgpu_userq_mgr_reset_work paths that can force per-queue or full GPU recovery, denying GPU service to all users on shared AMD GPU systems." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c" ], "versions": [ { "version": "8949843762631d9d0fc526dfb61a272dca29fc6f", "lessThan": "1050d258c7c56066d2dcaedf8d0ef66364062adc", "status": "affected", "versionType": "git" }, { "version": "8949843762631d9d0fc526dfb61a272dca29fc6f", "lessThan": "a609b6278bf3cde17eeee6620091465521e4b02c", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c" ], "versions": [ { "version": "6.16", "status": "affected" }, { "version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1050d258c7c56066d2dcaedf8d0ef66364062adc" }, { "url": "https://git.kernel.org/stable/c/a609b6278bf3cde17eeee6620091465521e4b02c" } ], "title": "drm/amdgpu: reject mapping a reserved doorbell to a new queue", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-68103", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:43:48.984694Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-662", "description": "CWE-662 Improper Synchronization" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:58:50.510Z" } } ] } }