usn-4909-1
Vulnerability from osv_ubuntu
Published
2021-04-13 21:55
Modified
2026-06-03 10:45
Summary
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities
Details

Loris Reiff discovered that the BPF implementation in the Linux kernel did not properly validate attributes in the getsockopt BPF hook. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-20194)

Olivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Schönherr discovered that the Xen paravirtualization backend in the Linux kernel did not properly propagate errors to frontend drivers in some situations. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). (CVE-2021-26930)

Jan Beulich discovered that multiple Xen backends in the Linux kernel did not properly handle certain error conditions under paravirtualization. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). (CVE-2021-26931)

It was discovered that the network block device (nbd) driver in the Linux kernel contained a use-after-free vulnerability during device setup. A local attacker with access to the nbd device could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-3348)


{
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              "id": "CVE-2021-3348",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
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            {
              "id": "CVE-2021-20194",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-26930",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-26931",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
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      "package": {
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        "name": "linux-aws-5.4",
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        "5.4.0-1029.30~18.04.1",
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        "5.4.0-1032.33~18.04.1",
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                  "type": "CVSS_V3"
                },
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            {
              "id": "CVE-2021-26930",
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                  "type": "CVSS_V3"
                },
                {
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              ]
            },
            {
              "id": "CVE-2021-26931",
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                  "type": "CVSS_V3"
                },
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                  "type": "Ubuntu"
                }
              ]
            }
          ],
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        }
      },
      "ecosystem_specific": {
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        "binaries": [
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                },
                {
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                  "type": "Ubuntu"
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              "id": "CVE-2021-26930",
              "severity": [
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                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
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              "id": "CVE-2021-26931",
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                  "type": "CVSS_V3"
                },
                {
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                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
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      "ranges": [
        {
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        "5.4.0-1025.25~18.04.1",
        "5.4.0-1028.29~18.04.1",
        "5.4.0-1029.31~18.04.1",
        "5.4.0-1030.32~18.04.1",
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    {
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              "severity": [
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                },
                {
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            },
            {
              "id": "CVE-2021-20194",
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                {
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                  "type": "CVSS_V3"
                },
                {
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                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-26930",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
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                  "type": "Ubuntu"
                }
              ]
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                  "type": "Ubuntu"
                }
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                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
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                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
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          "ecosystem": "Ubuntu:18.04:LTS"
        }
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            "binary_name": "linux-image-unsigned-5.4.0-1042-oracle",
            "binary_version": "5.4.0-1042.45"
          },
          {
            "binary_name": "linux-modules-5.4.0-1042-oracle",
            "binary_version": "5.4.0-1042.45"
          },
          {
            "binary_name": "linux-modules-extra-5.4.0-1042-oracle",
            "binary_version": "5.4.0-1042.45"
          },
          {
            "binary_name": "linux-oracle-headers-5.4.0-1042",
            "binary_version": "5.4.0-1042.45"
          },
          {
            "binary_name": "linux-oracle-tools-5.4.0-1042",
            "binary_version": "5.4.0-1042.45"
          },
          {
            "binary_name": "linux-tools-5.4.0-1042-oracle",
            "binary_version": "5.4.0-1042.45"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "linux-oracle",
        "purl": "pkg:deb/ubuntu/linux-oracle@5.4.0-1042.45?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.4.0-1042.45"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.3.0-1002.2",
        "5.3.0-1007.8",
        "5.3.0-1008.9",
        "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",
        "5.4.0-1034.36",
        "5.4.0-1035.38",
        "5.4.0-1037.40",
        "5.4.0-1038.41",
        "5.4.0-1039.42",
        "5.4.0-1041.44"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-3348",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-20194",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-26930",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-26931",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "linux-buildinfo-5.4.0-1033-raspi",
            "binary_version": "5.4.0-1033.36"
          },
          {
            "binary_name": "linux-headers-5.4.0-1033-raspi",
            "binary_version": "5.4.0-1033.36"
          },
          {
            "binary_name": "linux-image-5.4.0-1033-raspi",
            "binary_version": "5.4.0-1033.36"
          },
          {
            "binary_name": "linux-modules-5.4.0-1033-raspi",
            "binary_version": "5.4.0-1033.36"
          },
          {
            "binary_name": "linux-raspi-headers-5.4.0-1033",
            "binary_version": "5.4.0-1033.36"
          },
          {
            "binary_name": "linux-raspi-tools-5.4.0-1033",
            "binary_version": "5.4.0-1033.36"
          },
          {
            "binary_name": "linux-tools-5.4.0-1033-raspi",
            "binary_version": "5.4.0-1033.36"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "linux-raspi",
        "purl": "pkg:deb/ubuntu/linux-raspi@5.4.0-1033.36?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.4.0-1033.36"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.4.0-1007.7",
        "5.4.0-1008.8",
        "5.4.0-1011.11",
        "5.4.0-1012.12",
        "5.4.0-1013.13",
        "5.4.0-1015.15",
        "5.4.0-1016.17",
        "5.4.0-1018.20",
        "5.4.0-1019.21",
        "5.4.0-1021.24",
        "5.4.0-1022.25",
        "5.4.0-1023.26",
        "5.4.0-1025.28",
        "5.4.0-1026.29",
        "5.4.0-1028.31",
        "5.4.0-1029.32",
        "5.4.0-1030.33",
        "5.4.0-1032.35"
      ]
    }
  ],
  "aliases": [],
  "details": "Loris Reiff discovered that the BPF implementation in the Linux kernel did\nnot properly validate attributes in the getsockopt BPF hook. A local\nattacker could possibly use this to cause a denial of service (system\ncrash). (CVE-2021-20194)\n\nOlivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Sch\u00f6nherr\ndiscovered that the Xen paravirtualization backend in the Linux kernel did\nnot properly propagate errors to frontend drivers in some situations. An\nattacker in a guest VM could possibly use this to cause a denial of service\n(host domain crash). (CVE-2021-26930)\n\nJan Beulich discovered that multiple Xen backends in the Linux kernel did\nnot properly handle certain error conditions under paravirtualization. An\nattacker in a guest VM could possibly use this to cause a denial of service\n(host domain crash). (CVE-2021-26931)\n\nIt was discovered that the network block device (nbd) driver in the Linux\nkernel contained a use-after-free vulnerability during device setup. A\nlocal attacker with access to the nbd device could use this to cause a\ndenial of service (system crash) or possibly execute arbitrary code.\n(CVE-2021-3348)\n",
  "id": "USN-4909-1",
  "modified": "2026-06-03T10:45:25Z",
  "published": "2021-04-13T21:55:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4909-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3348"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-20194"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-26930"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-26931"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2021-3348",
    "UBUNTU-CVE-2021-20194",
    "UBUNTU-CVE-2021-26930",
    "UBUNTU-CVE-2021-26931"
  ]
}



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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.

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Detection rules are retrieved from Rulezet.

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