{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68258", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.378Z", "datePublished": "2026-08-10T12:01:32.149Z", "dateUpdated": "2026-08-18T06:55:55.677Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-18T06:55:55.677Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Check bounds on CRIU restore queue type and mqd size\n\nWe weren't checking whether the values provided in the private\ndata in kfd CRIU restore were within bounds.\n\nFor queue type, add a KFD_QUEUE_TYPE_MAX and ensure the provided\ntype is less than it.\n\nFor mqd_size, add new function mqd_size_from_queue_type and confirm\nthat the provided mqd_size matches expectations.\n\n(cherry picked from commit f19d8086f6644083c913d70bfdeee20e1b6f46a5)" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is reached only through the AMDKFD_IOC_CRIU_OP ioctl on the local /dev/kfd character device; there is no remote or adjacent-network path into amdkfd CRIU restore handling.\nAC:L - The attacker directly supplies mqd_size and type in the CRIU private data, so a single ioctl deterministically triggers the over-read or the ZERO_SIZE_PTR dereference; restore runs under p->mutex so no race must be won.\nPR:L - The attacker needs /dev/kfd access (render group) plus CAP_CHECKPOINT_RESTORE or CAP_SYS_ADMIN; CAP_CHECKPOINT_RESTORE is a delegated, non-root capability routinely granted to CRIU tooling and container checkpoint/restore services, so this is a limited privilege rather than full administrative control.\nUI:N - The attacker issues the CRIU restore and checkpoint ioctls entirely against its own KFD process context; no action by another user or victim process is required.\nS:U - The out-of-bounds read and resulting crash stay within the kernel's own security authority on the host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - restore_mqd() memcpy's a full ASIC MQD (e.g. sizeof(struct v9_mqd)) out of a kmalloc buffer sized by the attacker's smaller mqd_size, and criu_checkpoint_queues_device() then copies the entire MQD back to userspace, disclosing adjacent kernel slab contents.\nI:N - The destination MQD buffer is allocated by the mqd manager at its own correct size and ctl_stack_size is validated against node_props, so nothing is written out of bounds; the defect is purely a source-side over-read.\nA:H - With mqd_size and ctl_stack_size both zero, kmalloc(0) returns ZERO_SIZE_PTR and the memcpy faults reading address 0x10 while dqm_lock is held, oopsing the kernel; an out-of-range queue type also trips WARN(), panicking systems with panic_on_warn." } ] } ], "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/amdkfd/kfd_device_queue_manager.c", "drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h", "drivers/gpu/drm/amd/amdkfd/kfd_priv.h", "drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c" ], "versions": [ { "version": "42c6c48214b726c30918e8dc80e2168607d13ae4", "lessThan": "fd1691ec62701c982ea32e749678988c67fd4c21", "status": "affected", "versionType": "git" }, { "version": "42c6c48214b726c30918e8dc80e2168607d13ae4", "lessThan": "cc10a5839756982504ee8568fc1e1625962ab7f8", "status": "affected", "versionType": "git" }, { "version": "42c6c48214b726c30918e8dc80e2168607d13ae4", "lessThan": "47ea05f246bebc81c7796f56265cffd812cf0601", "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/amdkfd/kfd_device_queue_manager.c", "drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h", "drivers/gpu/drm/amd/amdkfd/kfd_priv.h", "drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c" ], "versions": [ { "version": "5.18", "status": "affected" }, { "version": "0", "lessThan": "5.18", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "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": "5.18", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fd1691ec62701c982ea32e749678988c67fd4c21" }, { "url": "https://git.kernel.org/stable/c/cc10a5839756982504ee8568fc1e1625962ab7f8" }, { "url": "https://git.kernel.org/stable/c/47ea05f246bebc81c7796f56265cffd812cf0601" } ], "title": "drm/amdkfd: Check bounds on CRIU restore queue type and mqd size", "x_generator": { "engine": "bippy-1.2.0" } } } }