{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50303", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-15T14:18:36.812Z", "datePublished": "2025-09-15T14:45:58.735Z", "dateUpdated": "2026-08-15T12:23:17.587Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T12:23:17.587Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix double release compute pasid\n\nIf kfd_process_device_init_vm returns failure after vm is converted to\ncompute vm and vm->pasid set to compute pasid, KFD will not take\npdd->drm_file reference. As a result, drm close file handler maybe\ncalled to release the compute pasid before KFD process destroy worker to\nrelease the same pasid and set vm->pasid to zero, this generates below\nWARNING backtrace and NULL pointer access.\n\nAdd helper amdgpu_amdkfd_gpuvm_set_vm_pasid and call it at the last step\nof kfd_process_device_init_vm, to ensure vm pasid is the original pasid\nif acquiring vm failed or is the compute pasid with pdd->drm_file\nreference taken to avoid double release same pasid.\n\n amdgpu: Failed to create process VM object\n ida_free called for id=32770 which is not allocated.\n WARNING: CPU: 57 PID: 72542 at ../lib/idr.c:522 ida_free+0x96/0x140\n RIP: 0010:ida_free+0x96/0x140\n Call Trace:\n amdgpu_pasid_free_delayed+0xe1/0x2a0 [amdgpu]\n amdgpu_driver_postclose_kms+0x2d8/0x340 [amdgpu]\n drm_file_free.part.13+0x216/0x270 [drm]\n drm_close_helper.isra.14+0x60/0x70 [drm]\n drm_release+0x6e/0xf0 [drm]\n __fput+0xcc/0x280\n ____fput+0xe/0x20\n task_work_run+0x96/0xc0\n do_exit+0x3d0/0xc10\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n RIP: 0010:ida_free+0x76/0x140\n Call Trace:\n amdgpu_pasid_free_delayed+0xe1/0x2a0 [amdgpu]\n amdgpu_driver_postclose_kms+0x2d8/0x340 [amdgpu]\n drm_file_free.part.13+0x216/0x270 [drm]\n drm_close_helper.isra.14+0x60/0x70 [drm]\n drm_release+0x6e/0xf0 [drm]\n __fput+0xcc/0x280\n ____fput+0xe/0x20\n task_work_run+0x96/0xc0\n do_exit+0x3d0/0xc10" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Reachable only via local ioctls on /dev/kfd (AMDKFD_IOC_ACQUIRE_VM) together with an amdgpu DRM render-node fd; no network or adjacent-protocol path exists.\nAC:L - An unprivileged GPU user can induce post-PASID-assignment failure (e.g., memory pressure in init_kfd_vm or GPUVM alloc for IB/CWSR) and then close the DRM fd before KFD teardown, fully controlling the double-free sequence.\nPR:L - Requires only ordinary access to /dev/kfd and render nodes (render group / seat uaccess, mode 0660); AMDKFD_IOC_ACQUIRE_VM has no capability flag and does not need root.\nUI:N - The attacker triggers the failing acquire_vm ioctl and subsequent fd close/exit entirely with their own process; no victim action is required.\nS:U - Impact stays within the host kernel’s authority (local DoS / same-host GPU PASID isolation failure); this is not a VM escape or cross-authority boundary breach.\nC:H - Double-free of the PASID ID allows reallocation to another process between frees, enabling PASID/IOMMU address-space confusion and cross-process GPU memory disclosure in the worst reasonable deployment.\nI:H - The same PASID reuse can overwrite VM lookups in the PASID xarray and break IOMMU isolation, giving a path to corrupt another process’s GPU address space; double-free is treated as high integrity impact.\nA:H - The documented second ida_free hits a NULL bitmap and causes a kernel NULL-pointer dereference/oops, reliably denying service." } ] } ], "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_amdkfd.h", "drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c", "drivers/gpu/drm/amd/amdkfd/kfd_process.c" ], "versions": [ { "version": "1685b01a858872075bc258a350153de0c7e95404", "lessThan": "89f0d766c9e3fdeafbed6f855d433c2768cde862", "status": "affected", "versionType": "git" }, { "version": "1685b01a858872075bc258a350153de0c7e95404", "lessThan": "a02c07b619899179384fde06f951530438a3512d", "status": "affected", "versionType": "git" }, { "version": "1685b01a858872075bc258a350153de0c7e95404", "lessThan": "1a799c4c190ea9f0e81028e3eb3037ed0ab17ff5", "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_amdkfd.h", "drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c", "drivers/gpu/drm/amd/amdkfd/kfd_process.c" ], "versions": [ { "version": "4.20", "status": "affected" }, { "version": "0", "lessThan": "4.20", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.19", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.5", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "4.20", "versionEndExcluding": "6.0.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/89f0d766c9e3fdeafbed6f855d433c2768cde862" }, { "url": "https://git.kernel.org/stable/c/a02c07b619899179384fde06f951530438a3512d" }, { "url": "https://git.kernel.org/stable/c/1a799c4c190ea9f0e81028e3eb3037ed0ab17ff5" } ], "title": "drm/amdkfd: Fix double release compute pasid", "x_generator": { "engine": "bippy-1.2.0" } } } }