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High

Security advisory

Type: advisorySources: OSVCVE: CVE-2019-20175

An issue was discovered in ide_dma_cb() in hw/ide/core.c in QEMU 2.4.0 through 4.2.0. The guest system can crash the QEMU process in the host system via a special SCSI_IOCTL_SEND_COMMAND. It hits an assertion that implies that the size of successful DMA transfers there must be a multiple of 512 (the size of a sector). NOTE: a member of the QEMU security team disputes the significance of this issue because a "privileged guest user has many ways to cause similar DoS effect, without triggering this assert.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2019-20175
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 06:06 UTC · Revision 1

Source evidence

CVE-2019-20175

core-osv · Original source

Published 31 Dec 2019, 04:15 UTC

An issue was discovered in ide_dma_cb() in hw/ide/core.c in QEMU 2.4.0 through 4.2.0. The guest system can crash the QEMU process in the host system via a special SCSI_IOCTL_SEND_COMMAND. It hits an assertion that implies that the size of successful DMA transfers there must be a multiple of 512 (the size of a sector). NOTE: a member of the QEMU security team disputes the significance of this issue because a "privileged guest user has many ways to cause similar DoS effect, without triggering this assert.

osv:CVE-2019-20175
Complete source record
{
  "id": "919f086073eecb7d6a94b8a47daf3266626ecf0f55b1bed07739501ee2c5f48e",
  "url": "https://osv.dev/vulnerability/CVE-2019-20175",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-20175",
    "summary": "An issue was discovered in ide_dma_cb() in hw/ide/core.c in QEMU 2.4.0 through 4.2.0. The guest system can crash the QEMU process in the host system via a special SCSI_IOCTL_SEND_COMMAND. It hits an assertion that implies that the size of successful DMA transfers there must be a multiple of 512 (the size of a sector). NOTE: a member of the QEMU security team disputes the significance of this issue because a \"privileged guest user has many ways to cause similar DoS effect, without triggering this assert.",
    "evidence": "osv:CVE-2019-20175",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2019-20175",
      "aliases": [
        "CVE-2019-20175"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/qemu/qemu",
              "type": "GIT",
              "events": [
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                  "introduced": "5c79ae3615d5dafdf1bb09b7a356a3a005714e3d"
                },
                {
                  "last_affected": "b0ca999a43a22b38158a222233d3f5881648bb4f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.4.0"
                      },
                      {
                        "last_affected": "4.2.0"
                      }
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                    "source": "CPE_RANGE"
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          "versions": [
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            "v2.9.0",
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            "v2.8.0",
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            "v2.8.0-rc4",
            "v2.8.0-rc3",
            "v2.8.0-rc2",
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            "v2.8.0-rc0",
            "v2.7.0",
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            "v2.7.0-rc3",
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            "v2.6.0",
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            "v2.5.0",
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            "v2.5.0-rc3",
            "v2.5.0-rc2",
            "v2.5.0-rc1",
            "v2.5.0-rc0",
            "v2.4.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-20175.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://gitlab.com/qemu-project/qemu",
              "type": "GIT",
              "events": [
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                },
                {
                  "last_affected": "b0ca999a43a22b38158a222233d3f5881648bb4f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.4.0"
                      },
                      {
                        "last_affected": "4.2.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.2.0",
            "v4.2.0-rc5",
            "v4.2.0-rc4",
            "v4.2.0-rc3",
            "v4.2.0-rc2",
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            "v4.2.0-rc0",
            "v4.1.0",
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            "v3.1.0",
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            "v3.1.0-rc4",
            "v3.1.0-rc3",
            "v3.1.0-rc2",
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            "v3.0.0-rc4",
            "v3.0.0-rc3",
            "v3.0.0-rc2",
            "v3.0.0-rc1",
            "v3.0.0-rc0",
            "v2.12.0",
            "v2.12.0-rc4",
            "v2.12.0-rc3",
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            "v2.5.0-rc3",
            "v2.5.0-rc2",
            "v2.5.0-rc1",
            "v2.5.0-rc0",
            "v2.4.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-20175.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:35.489569558Z",
      "provider": "osv",
      "references": [
        "https://www.mail-archive.com/qemu-devel%40nongnu.org/msg667396.html",
        "https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg03869.html",
        "https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg00597.html",
        "https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg02165.html",
        "https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg01651.html"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2019-20175",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 433747,
  "published_at": "2019-12-31T04:15:10.503+00:00"
}