LSN-0077-1 (UBUNTU-CVE-2021-3492)

Vulnerability from osv_ubuntu – Published: 2021-05-17 07:04 – Updated: 2026-06-03 10:46 – Source website
VLAI
Summary
Kernel Live Patch Security Notice
Details

Vincent Dehors discovered that the shiftfs file system in the Ubuntu Linux kernel did not properly handle faults in copy_from_user() when passing through ioctls to an underlying file system. A local attacker could use this to cause a denial of service (memory exhaustion) or execute arbitrary code.(CVE-2021-3492)

References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gke_(\\d+)",
        "module_version": "77"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "linux-gke-5.4",
        "purl": "pkg:deb/ubuntu/linux-gke-5.4@5.4.0-1042.44~18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.4.0-1042.44~18.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.4.0-1025.25~18.04.1",
        "5.4.0-1027.28~18.04.1",
        "5.4.0-1029.31~18.04.1",
        "5.4.0-1030.32~18.04.1",
        "5.4.0-1032.34~18.04.1",
        "5.4.0-1033.35~18.04.1",
        "5.4.0-1035.37~18.04.1",
        "5.4.0-1036.38~18.04.1",
        "5.4.0-1037.39~18.04.1",
        "5.4.0-1039.41~18.04.1",
        "5.4.0-1040.42~18.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gkeop_(\\d+)",
        "module_version": "77"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "linux-gkeop-5.4",
        "purl": "pkg:deb/ubuntu/linux-gkeop-5.4@5.4.0-1014.15~18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.4.0-1014.15~18.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.4.0-1001.1",
        "5.4.0-1003.3",
        "5.4.0-1004.5",
        "5.4.0-1005.6",
        "5.4.0-1007.8~18.04.1",
        "5.4.0-1008.9~18.04.1",
        "5.4.0-1009.10~18.04.1",
        "5.4.0-1010.11~18.04.1",
        "5.4.0-1011.12~18.04.2",
        "5.4.0-1012.13~18.04.1",
        "5.4.0-1013.14~18.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_(?:generic|lowlatency)_(\\d+)",
        "module_version": "77"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "linux-hwe-5.4",
        "purl": "pkg:deb/ubuntu/linux-hwe-5.4@5.4.0-72.80~18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.4.0-72.80~18.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.4.0-37.41~18.04.1",
        "5.4.0-39.43~18.04.1",
        "5.4.0-40.44~18.04.1",
        "5.4.0-42.46~18.04.1",
        "5.4.0-45.49~18.04.2",
        "5.4.0-47.51~18.04.1",
        "5.4.0-48.52~18.04.1",
        "5.4.0-51.56~18.04.1",
        "5.4.0-52.57~18.04.1",
        "5.4.0-53.59~18.04.1",
        "5.4.0-54.60~18.04.1",
        "5.4.0-56.62~18.04.1",
        "5.4.0-58.64~18.04.1",
        "5.4.0-59.65~18.04.1",
        "5.4.0-60.67~18.04.1",
        "5.4.0-62.70~18.04.1",
        "5.4.0-64.72~18.04.1",
        "5.4.0-65.73~18.04.1",
        "5.4.0-66.74~18.04.2",
        "5.4.0-67.75~18.04.1",
        "5.4.0-70.78~18.04.1",
        "5.4.0-71.79~18.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_(?:generic|lowlatency)_(\\d+)",
        "module_version": "77"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "linux",
        "purl": "pkg:deb/ubuntu/linux@5.4.0-72.80?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.4.0-72.80"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.3.0-18.19",
        "5.3.0-24.26",
        "5.4.0-9.12",
        "5.4.0-18.22",
        "5.4.0-21.25",
        "5.4.0-24.28",
        "5.4.0-25.29",
        "5.4.0-26.30",
        "5.4.0-28.32",
        "5.4.0-29.33",
        "5.4.0-31.35",
        "5.4.0-33.37",
        "5.4.0-37.41",
        "5.4.0-39.43",
        "5.4.0-40.44",
        "5.4.0-42.46",
        "5.4.0-45.49",
        "5.4.0-47.51",
        "5.4.0-48.52",
        "5.4.0-51.56",
        "5.4.0-52.57",
        "5.4.0-53.59",
        "5.4.0-54.60",
        "5.4.0-56.62",
        "5.4.0-58.64",
        "5.4.0-59.65",
        "5.4.0-60.67",
        "5.4.0-62.70",
        "5.4.0-64.72",
        "5.4.0-65.73",
        "5.4.0-66.74",
        "5.4.0-67.75",
        "5.4.0-70.78",
        "5.4.0-71.79"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gcp_(\\d+)",
        "module_version": "77"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "linux-gcp",
        "purl": "pkg:deb/ubuntu/linux-gcp@5.4.0-1042.45?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.4.0-1042.45"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.3.0-1004.4",
        "5.3.0-1009.10",
        "5.3.0-1011.12",
        "5.4.0-1005.5",
        "5.4.0-1007.7",
        "5.4.0-1008.8",
        "5.4.0-1009.9",
        "5.4.0-1011.11",
        "5.4.0-1015.15",
        "5.4.0-1018.18",
        "5.4.0-1019.19",
        "5.4.0-1021.21",
        "5.4.0-1022.22",
        "5.4.0-1024.24",
        "5.4.0-1025.25",
        "5.4.0-1028.29",
        "5.4.0-1029.31",
        "5.4.0-1030.32",
        "5.4.0-1032.34",
        "5.4.0-1033.35",
        "5.4.0-1034.37",
        "5.4.0-1036.39",
        "5.4.0-1037.40",
        "5.4.0-1038.41",
        "5.4.0-1040.43",
        "5.4.0-1041.44"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gke_(\\d+)",
        "module_version": "77"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "linux-gke",
        "purl": "pkg:deb/ubuntu/linux-gke@5.4.0-1042.44?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.4.0-1042.44"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.4.0-1033.35",
        "5.4.0-1035.37",
        "5.4.0-1036.38",
        "5.4.0-1037.39",
        "5.4.0-1039.41",
        "5.4.0-1041.43"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gkeop_(\\d+)",
        "module_version": "77"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "linux-gkeop",
        "purl": "pkg:deb/ubuntu/linux-gkeop@5.4.0-1014.15?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.4.0-1014.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.4.0-1008.9",
        "5.4.0-1009.10",
        "5.4.0-1010.11",
        "5.4.0-1011.12",
        "5.4.0-1012.13",
        "5.4.0-1013.14"
      ]
    }
  ],
  "aliases": [],
  "details": "Vincent Dehors discovered that the shiftfs file system in the Ubuntu Linux\nkernel did not properly handle faults in copy_from_user() when passing\nthrough ioctls to an underlying file system. A local attacker could use\nthis to cause a denial of service (memory exhaustion) or execute arbitrary\ncode.(CVE-2021-3492)",
  "id": "LSN-0077-1",
  "modified": "2026-06-03T10:46:31Z",
  "published": "2021-05-17T07:04:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/LSN-0077-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3492"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "Kernel Live Patch Security Notice",
  "upstream": [
    "UBUNTU-CVE-2021-3492"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.