linux — security advisory

{
  "id": "f14a0e3ff0b40df1497e6eee6ab81ddc078239b336fec692c0f8336196a732c4",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2022-49771",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2022-49771",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: dm ioctl: fix misbehavior if list_versions races with module loading __list_versions will first estimate the required space using the \"dm_target_iterate(list_version_get_needed, &needed)\" call and then will fill the space using the \"dm_target_iterate(list_version_get_info, &iter_info)\" call. Each of these calls locks the targets using the \"down_read(&_lock)\" and \"up_read(&_lock)\" calls, however between the first and second \"dm_target_iterate\" there is no lock held and the target modules can be loaded at this point, so the second \"dm_target_iterate\" call may need more space than what was the first \"dm_target_iterate\" returned. The code tries to handle this overflow (see the beginning of list_version_get_info), however this handling is incorrect. The code sets \"param->data_size = param->data_start + needed\" and \"iter_info.end = (char *)vers+len\" - \"needed\" is the size returned by the first dm_target_iterate call; \"len\" is the size of the buffer allocated by userspace. \"len\" may be greater than \"needed\"; in this case, the code will write up to \"len\" bytes into the buffer, however param->data_size is set to \"needed\", so it may write data past the param->data_size value. The ioctl interface copies only up to param->data_size into userspace, thus part of the result will be truncated. Fix this bug by setting \"iter_info.end = (char *)vers + needed;\" - this guarantees that the second \"dm_target_iterate\" call will writ",
    "evidence": "osv:DEBIAN-CVE-2022-49771",
    "products": [
      {
        "name": {
          "value": "linux",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.0.10-1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "linux",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.0.10-1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "linux",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.0.10-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2022-49771",
      "aliases": [
        "DEBIAN-CVE-2022-49771"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6.0.10-1"
                }
              ]
            }
          ],
          "package": {
            "name": "linux",
            "purl": "pkg:deb/debian/linux?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49771.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6.0.10-1"
                }
              ]
            }
          ],
          "package": {
            "name": "linux",
            "purl": "pkg:deb/debian/linux?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49771.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6.0.10-1"
                }
              ]
            }
          ],
          "package": {
            "name": "linux",
            "purl": "pkg:deb/debian/linux?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49771.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-15T08:03:12.132547310Z",
      "provider": "osv",
      "upstream": [
        "CVE-2022-49771"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2022-49771"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2022-49771",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 325693,
  "published_at": "2025-05-01T15:16:00.237+00:00"
}