180 lines
11 KiB
JSON
180 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-97496",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-24T16:01:01.150Z",
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"datePublished": "2026-09-24T16:04:43.625Z",
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"dateUpdated": "2026-10-03T10:58:59.453Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-03T10:58:59.453Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix OOB memory exposure in get_wave_state()\n\nThe get_wave_state() function for v9 trusts cp_hqd_cntl_stack_size and\ncp_hqd_cntl_stack_offset values read directly from the MQD, which are\nwritten by GPU microcode and fully attacker-controlled on the\nCRIU-restore path (via AMDKFD_IOC_RESTORE_PROCESS with H3).\n\nthis leads to an unbounded copy_to_user() that can leak adjacent\nGTT/kernel memory. If offset > size, integer underflow produces a ~4 GiB\nread length, if size is set to 1 MiB against a 4 KiB allocation, we leak\n1 MiB of adjacent kernel memory (other queues' MQDs, ring buffers, KASLR\npointers).\n\nFix by clamping both cp_hqd_cntl_stack_size to the actual allocated\nbuffer size (q->ctl_stack_size) and cp_hqd_cntl_stack_offset to the\nclamped size before performing arithmetic and copy_to_user().\n\nThis ensures we never read beyond the allocated kernel BO regardless of\nattacker-supplied MQD field values."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - Attacker-controlled cp_hqd_cntl_stack_size/offset enter via AMDKFD_IOC_CRIU_OP KFD_CRIU_OP_RESTORE (kfd_ioctl_criu → criu_restore → kfd_criu_restore_queue → restore_mqd memcpy of the user MQD), then v9 get_wave_state() runs from kfd_ioctl_get_queue_wave_state (AMDKFD_IOC_GET_QUEUE_WAVE_STATE) on /dev/kfd; no remote protocol carries those fields.\nAC:L - restore_mqd() installs the crafted MQD then sets qp->is_active=0, so AMDKFD_IOC_GET_QUEUE_WAVE_STATE deterministically passes dqm get_wave_state()'s !is_active and cwsr_enabled checks (cwsr_enable defaults to 1) and v9 get_wave_state() copy_to_user()s using unclamped size-offset; no race or firmware quirk is required.\nPR:L - AMDKFD_IOC_GET_QUEUE_WAVE_STATE has ioctl flags 0, but the MQD size/offset that make get_wave_state() over-read are attacker-controlled only after KFD_CRIU_OP_RESTORE; kfd_ioctl() admits that op only with capable(CAP_CHECKPOINT_RESTORE) or capable(CAP_SYS_ADMIN), a delegated non-root cap routinely granted to CRIU/container checkpoint services.\nUI:N - The attacker opens /dev/kfd and issues KFD_CRIU_OP_RESTORE then AMDKFD_IOC_GET_QUEUE_WAVE_STATE against its own KFD process; no other user must mount a filesystem, open a file, or otherwise interact.\nS:U - The unbounded copy_to_user() from the kernel MQD control-stack BO in v9 get_wave_state() discloses host kernel/GTT memory inside the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Pre-fix v9 get_wave_state() copy_to_user()s (cp_hqd_cntl_stack_size - cp_hqd_cntl_stack_offset) bytes from mqd+AMDGPU_GPU_PAGE_SIZE without clamping to q->ctl_stack_size, so a restored 1MiB size against a 4KiB allocate_mqd() BO (or offset>size underflow to ~4GiB) dumps adjacent GTT/kernel memory including other MQDs and KASLR pointers.\nI:N - The defective operation is copy_to_user() from the kernel control-stack BO to the caller's ctl_stack_address; restore_mqd() writes only sizeof(struct v9_mqd) plus ctl_stack_size into the buffer allocate_mqd() sized from q->ctl_stack_size, so this bug does not modify kernel memory out of bounds.\nA:H - A restored cp_hqd_cntl_stack_size of ~1MiB or an offset>size underflow to ~4GiB makes get_wave_state() copy_to_user() walk off the small kmap/vmap GTT/VRAM BO into unmapped kernel VA (and can trip CONFIG_HARDENED_USERCOPY), producing a kernel oops."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v9.c"
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],
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"versions": [
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{
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"version": "42c6c48214b726c30918e8dc80e2168607d13ae4",
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"lessThan": "e2bef0f168be46692a6b900916ff5da3771480ed",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "42c6c48214b726c30918e8dc80e2168607d13ae4",
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"lessThan": "d9183d974ddd5f09d029beaf359275ac20d4d5fe",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "42c6c48214b726c30918e8dc80e2168607d13ae4",
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"lessThan": "ec646686613d8ab05b282d1463a7baa49fd6b83b",
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"status": "affected",
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},
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{
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"version": "42c6c48214b726c30918e8dc80e2168607d13ae4",
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"lessThan": "7ef144458f48d5589e36f1b3d83e83db2e5c5ba5",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v9.c"
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],
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"versions": [
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{
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"version": "5.18",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.18",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.111",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.53",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.18",
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"versionEndExcluding": "6.6.158"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.18",
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"versionEndExcluding": "6.18.53"
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.18",
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/e2bef0f168be46692a6b900916ff5da3771480ed"
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},
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{
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"url": "https://git.kernel.org/stable/c/d9183d974ddd5f09d029beaf359275ac20d4d5fe"
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},
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{
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"url": "https://git.kernel.org/stable/c/ec646686613d8ab05b282d1463a7baa49fd6b83b"
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},
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{
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"url": "https://git.kernel.org/stable/c/7ef144458f48d5589e36f1b3d83e83db2e5c5ba5"
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}
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],
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"title": "drm/amdkfd: Fix OOB memory exposure in get_wave_state()",
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