{"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": "2026-08-13T22:39:34.798Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-13T22:39:34.798Z"}, "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-rc2", "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-rc2"}]}]}], "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"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1050d258c7c56066d2dcaedf8d0ef66364062adc", "status": "affected", "version": "8949843762631d9d0fc526dfb61a272dca29fc6f", "versionType": "git"}, {"lessThan": "a609b6278bf3cde17eeee6620091465521e4b02c", "status": "affected", "version": "8949843762631d9d0fc526dfb61a272dca29fc6f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"lessThan": "6.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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)"}], "id": "CVE-2026-68103", "lastModified": "2026-08-13T23:17:16.030", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-10T13:19:54.983", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1050d258c7c56066d2dcaedf8d0ef66364062adc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a609b6278bf3cde17eeee6620091465521e4b02c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: drm/amdgpu: reject mapping a reserved doorbell to a new queue", "id": "2513448", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513448"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/amdgpu: reject mapping a reserved doorbell to a new queue\nWhen creating an user-queue, the user space\nprovides a doorbell BO handle and an offset within\nthe bo to obtain a doorbell.\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.\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.\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(cherry picked from commit 6244eae22966350db52faf9c1369d3b2ffc5de4e)", "A flaw was found in the drm/amdgpu component of the Linux kernel. A local attacker could exploit a vulnerability where creating a user-queue with specific parameters overwrites an existing doorbell mapping. This could lead to misrouting of interrupt requests (IRQs) and incorrect cleanup processes, potentially resulting in a denial of service."], "name": "CVE-2026-68103", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68103\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68103\nhttps://lore.kernel.org/linux-cve-announce/2026081052-CVE-2026-68103-1fa4@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,1050d258c7c56066d2dcaedf8d0ef66364062adc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,a609b6278bf3cde17eeee6620091465521e4b02c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,7.1.6)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T13:45:03.444550+00:00", "updated": "2026-08-14T02:00:15.470981+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}