CVE-2021-47142 (GCVE-0-2021-47142)

Vulnerability from cvelistv5 – Published: 2024-03-25 09:07 – Updated: 2026-08-05 08:46
VLAI
Title
drm/amdgpu: Fix a use-after-free
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix a use-after-free looks like we forget to set ttm->sg to NULL. Hit panic below [ 1235.844104] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b7b4b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI [ 1235.989074] Call Trace: [ 1235.991751] sg_free_table+0x17/0x20 [ 1235.995667] amdgpu_ttm_backend_unbind.cold+0x4d/0xf7 [amdgpu] [ 1236.002288] amdgpu_ttm_backend_destroy+0x29/0x130 [amdgpu] [ 1236.008464] ttm_tt_destroy+0x1e/0x30 [ttm] [ 1236.013066] ttm_bo_cleanup_memtype_use+0x51/0xa0 [ttm] [ 1236.018783] ttm_bo_release+0x262/0xa50 [ttm] [ 1236.023547] ttm_bo_put+0x82/0xd0 [ttm] [ 1236.027766] amdgpu_bo_unref+0x26/0x50 [amdgpu] [ 1236.032809] amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x7aa/0xd90 [amdgpu] [ 1236.040400] kfd_ioctl_alloc_memory_of_gpu+0xe2/0x330 [amdgpu] [ 1236.046912] kfd_ioctl+0x463/0x690 [amdgpu]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:55 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 0707c3fea8102d211631ba515ef2159707561b0d (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 3293cf3513d69f00c14d43e2020826d45ea0e46a (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 952ab3f9f48eb0e8050596d41951cf516be6b122 (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < a849e218556f932576c0fb1c5a88714b61709a17 (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 7398c2aab4da960761ec182d04d6d5abbb4a226e (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < f98cdf084405333ee2f5be548a91b2d168e49276 (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < d4ea141fd4b40636a8326df5a377d9c5cf9b3faa (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 1e5c37385097c35911b0f8a0c67ffd10ee1af9a2 (git)
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Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 4.4.271 , ≤ 4.4.* (semver)
Unaffected: 4.9.271 , ≤ 4.9.* (semver)
Unaffected: 4.14.235 , ≤ 4.14.* (semver)
Unaffected: 4.19.193 , ≤ 4.19.* (semver)
Unaffected: 5.4.124 , ≤ 5.4.* (semver)
Unaffected: 5.10.42 , ≤ 5.10.* (semver)
Unaffected: 5.12.9 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Fix a use-after-free\n\nlooks like we forget to set ttm-\u003esg to NULL.\nHit panic below\n\n[ 1235.844104] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b7b4b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI\n[ 1235.989074] Call Trace:\n[ 1235.991751]  sg_free_table+0x17/0x20\n[ 1235.995667]  amdgpu_ttm_backend_unbind.cold+0x4d/0xf7 [amdgpu]\n[ 1236.002288]  amdgpu_ttm_backend_destroy+0x29/0x130 [amdgpu]\n[ 1236.008464]  ttm_tt_destroy+0x1e/0x30 [ttm]\n[ 1236.013066]  ttm_bo_cleanup_memtype_use+0x51/0xa0 [ttm]\n[ 1236.018783]  ttm_bo_release+0x262/0xa50 [ttm]\n[ 1236.023547]  ttm_bo_put+0x82/0xd0 [ttm]\n[ 1236.027766]  amdgpu_bo_unref+0x26/0x50 [amdgpu]\n[ 1236.032809]  amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x7aa/0xd90 [amdgpu]\n[ 1236.040400]  kfd_ioctl_alloc_memory_of_gpu+0xe2/0x330 [amdgpu]\n[ 1236.046912]  kfd_ioctl+0x463/0x690 [amdgpu]"
            }
          ],
          "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 - The bug is reached through local ioctls on /dev/kfd (kfd_ioctl_alloc_memory_of_gpu with KFD_IOC_ALLOC_MEM_FLAGS_USERPTR) or the DRM render-node AMDGPU_GEM_USERPTR path, not via network packet processing.\nAC:L - An unprivileged local attacker can reliably drive the userptr populate/unpopulate/destroy sequence via KFD/DRM ioctls and control concurrent GPU memory operations; no conditions outside attacker influence are required to hit the dangling ttm-\u003esg use.\nPR:L - /dev/kfd and DRM render nodes are mode 0660 group render (with uaccess for seated users); kfd_open and the GEM userptr ioctl perform no capability checks, so a normal unprivileged render-group user can reach the vulnerable code.\nUI:N - Exploitation requires only the attacker\u2019s own ioctl calls against the GPU device nodes; no separate victim action is needed.\nS:U - The vulnerability corrupts kernel memory within the host kernel\u2019s authority and enables local privilege escalation, but does not cross a VM/IOMMU/sandbox boundary.\nC:H - This is a use-after-free of the kmalloc\u2019d sg_table: after kfree(ttm-\u003esg) without NULLing, later unbind reads the freed object, and reclaim/spray of that slab can expose arbitrary kernel memory contents.\nI:H - Use of the reclaimed dangling ttm-\u003esg in sg_free_table() yields an attacker-controlled scatterlist walk/arbitrary free primitive, which is a standard path to arbitrary kernel write and control-flow hijacking.\nA:H - The demonstrated failure is a kernel general protection fault/oops in sg_free_table during amdgpu_ttm_backend_unbind, so availability impact is complete host crash."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:46:18.601Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/0707c3fea8102d211631ba515ef2159707561b0d"
            },
            {
              "url": "https://git.kernel.org/stable/c/3293cf3513d69f00c14d43e2020826d45ea0e46a"
            },
            {
              "url": "https://git.kernel.org/stable/c/952ab3f9f48eb0e8050596d41951cf516be6b122"
            },
            {
              "url": "https://git.kernel.org/stable/c/a849e218556f932576c0fb1c5a88714b61709a17"
            },
            {
              "url": "https://git.kernel.org/stable/c/7398c2aab4da960761ec182d04d6d5abbb4a226e"
            },
            {
              "url": "https://git.kernel.org/stable/c/f98cdf084405333ee2f5be548a91b2d168e49276"
            },
            {
              "url": "https://git.kernel.org/stable/c/d4ea141fd4b40636a8326df5a377d9c5cf9b3faa"
            },
            {
              "url": "https://git.kernel.org/stable/c/1e5c37385097c35911b0f8a0c67ffd10ee1af9a2"
            }
          ],
          "title": "drm/amdgpu: Fix a use-after-free",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47142",
        "datePublished": "2024-03-25T09:07:40.374Z",
        "dateReserved": "2024-03-04T18:12:48.842Z",
        "dateUpdated": "2026-08-05T08:46:18.601Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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