CVE-2026-74447 (GCVE-0-2026-74447)
Vulnerability from cvelistv5
Published
2026-08-15 12:26
Modified
2026-08-17 05:47
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment eop_ring_buffer_size in struct queue_properties is a u32. In kfd_queue_acquire_buffers() the expected EOP buffer size is computed as ALIGN(eop_ring_buffer_size, PAGE_SIZE); ALIGN uses typeof(x), so the addition is done in 32-bit. A user-supplied size of 0xFFFFF001 wraps to 0, causing kfd_queue_buffer_get() to skip its exact-size check (gated on size != 0) and accept any BO mapped at the address. On GFX8/GFX9 the MQD cp_hqd_eop_control is then programmed for an 8KB EOP ring backed by a 4KB BO, so CP EOP writes can land past the buffer and fault the GPU. Cast the operand to u64 so the alignment is computed in 64-bit; the size check in kfd_queue_buffer_get() then rejects the oversized request. (cherry picked from commit ae443117b742c357bfef3a7bddabf76fcf86e9ef)
References
Impacted products
Vendor Product Version
Linux Linux Version: ee0dc6c66a913260311876a4b2b53fe0b9bc3f94
Version: acfc84cfa70aca5b970faf152979bc97b9f8b0c0
Version: 42ea9cf2f16b7131cb7302acb3dac510968f8bdc
Version: 42ea9cf2f16b7131cb7302acb3dac510968f8bdc
Version: c6ce687077cc67e4f3cbd0c89cb356fbbce91f4c
Version: 6.12.75   ≤
Version: 6.18.16   ≤
Version: 6.19.6   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_queue.c"
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        },
        {
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          "product": "Linux",
          "programFiles": [
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          ],
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "versionEndExcluding": "6.12.103",
                  "versionStartIncluding": "6.12.75",
                  "vulnerable": true
                },
                {
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment\n\neop_ring_buffer_size in struct queue_properties is a u32. In\nkfd_queue_acquire_buffers() the expected EOP buffer size is computed as\nALIGN(eop_ring_buffer_size, PAGE_SIZE); ALIGN uses typeof(x), so the\naddition is done in 32-bit. A user-supplied size of 0xFFFFF001 wraps to\n0, causing kfd_queue_buffer_get() to skip its exact-size check (gated on\nsize != 0) and accept any BO mapped at the address. On GFX8/GFX9 the MQD\ncp_hqd_eop_control is then programmed for an 8KB EOP ring backed by a 4KB\nBO, so CP EOP writes can land past the buffer and fault the GPU.\n\nCast the operand to u64 so the alignment is computed in 64-bit; the size\ncheck in kfd_queue_buffer_get() then rejects the oversized request.\n\n(cherry picked from commit ae443117b742c357bfef3a7bddabf76fcf86e9ef)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires local ioctl access to /dev/kfd (KFD_IOC_CREATE_QUEUE) after opening the AMDGPU render node; there is no network, adjacent-wireless, or physical-device path to the vulnerable kfd_queue_acquire_buffers() code.\nAC:L - An attacker who can open /dev/kfd and map GPU buffers can reliably bypass the EOP size check with eop_buffer_size=0xFFFFF001 (32-bit ALIGN wraps to 0) and trigger CP EOP writes by submitting compute work on the created queue.\nPR:L - Only a local unprivileged user with AMDGPU/KFD access (typically membership in the render group for /dev/dri/renderD* and /dev/kfd) is required; no real-root or init-namespace capabilities are needed.\nUI:N - No victim interaction is required; the attacker drives the full chain via their own KFD and DRM file descriptors, GPU memory mappings, and queue submission.\nS:U - The bug corrupts GPU virtual memory within the attacker\u0027s own process VMID and can fault or reset the shared GPU; it does not cross a VM/host, IOMMU, or sandbox security boundary into another authority.\nC:H - CP hardware performs out-of-bounds EOP writes up to 8KB into a 4KB backing object, corrupting adjacent GPU-mapped memory that can be read back or chained into further memory disclosure primitives.\nI:H - The MQD is programmed with an 8KB EOP ring while only a 4KB buffer is validated, causing the GPU command processor to write attacker-triggered data past the buffer end into adjacent GPU mappings.\nA:H - EOP writes beyond the undersized buffer cause GPU VM faults that can hang the device and schedule amdgpu_amdkfd_gpu_reset(), denying GPU service to all co-located workloads on shared cloud/HPC/desktop GPUs."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:47:18.735Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/273548eb997c6be85230c1236b18784b09f6203c"
        },
        {
          "url": "https://git.kernel.org/stable/c/6dc0b4b39ed4f11ef70f76ecea8537e35f45342b"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961"
        },
        {
          "url": "https://git.kernel.org/stable/c/83463a96ea3c7d8ae636a4d6a0ba63c9ce410724"
        }
      ],
      "title": "drm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74447",
    "datePublished": "2026-08-15T12:26:53.305Z",
    "dateReserved": "2026-08-15T05:44:03.898Z",
    "dateUpdated": "2026-08-17T05:47:18.735Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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