usn-5091-1
Vulnerability from osv_ubuntu
Published
2021-09-28 02:30
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, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4 vulnerabilities
Details

Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack. An attacker could use this to expose sensitive information. (CVE-2021-33624)

It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu ring buffer state. A privileged attacker could use this to cause a denial of service. (CVE-2021-3679)

Alexey Kardashevskiy discovered that the KVM implementation for PowerPC systems in the Linux kernel did not properly validate RTAS arguments in some situations. An attacker in a guest vm could use this to cause a denial of service (host OS crash) or possibly execute arbitrary code. (CVE-2021-37576)

It was discovered that the Virtio console implementation in the Linux kernel did not properly validate input lengths in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-38160)

Michael Wakabayashi discovered that the NFSv4 client implementation in the Linux kernel did not properly order connection setup operations. An attacker controlling a remote NFS server could use this to cause a denial of service on the client. (CVE-2021-38199)

It was discovered that the MAX-3421 host USB device driver in the Linux kernel did not properly handle device removal events. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2021-38204)


{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-3679",
              "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"
                }
              ]
            },
            {
              "id": "CVE-2021-33624",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-37576",
              "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": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-38160",
              "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": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-38199",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-38204",
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                {
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                  "type": "CVSS_V3"
                },
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                }
              ]
            }
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        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
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        "5.4.0-1029.30~18.04.1",
        "5.4.0-1030.31~18.04.1",
        "5.4.0-1032.33~18.04.1",
        "5.4.0-1034.35~18.04.1",
        "5.4.0-1035.37~18.04.1",
        "5.4.0-1037.39~18.04.1",
        "5.4.0-1038.40~18.04.1",
        "5.4.0-1039.41~18.04.1",
        "5.4.0-1041.43~18.04.1",
        "5.4.0-1043.45~18.04.1",
        "5.4.0-1045.47~18.04.1",
        "5.4.0-1047.49~18.04.1",
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        "5.4.0-1051.53~18.04.1",
        "5.4.0-1054.57~18.04.1",
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        "5.4.0-1056.59~18.04.1"
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      "database_specific": {
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              "id": "CVE-2021-3679",
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                {
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                  "type": "CVSS_V3"
                },
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                  "score": "low",
                  "type": "Ubuntu"
                }
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                },
                {
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                  "type": "Ubuntu"
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              "id": "CVE-2021-38160",
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                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
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              "id": "CVE-2021-38199",
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                  "type": "CVSS_V3"
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              "id": "CVE-2021-38204",
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                  "type": "CVSS_V3"
                },
                {
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                  "type": "Ubuntu"
                }
              ]
            }
          ],
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        }
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        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "linux-azure-5.4-cloud-tools-5.4.0-1059",
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          },
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        "5.4.0-1026.26~18.04.1",
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        "5.4.0-1041.43~18.04.1",
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        "5.4.0-1044.46~18.04.1",
        "5.4.0-1046.48~18.04.1",
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    {
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            {
              "id": "CVE-2021-3679",
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                {
                  "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"
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              ]
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              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-37576",
              "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": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-38160",
              "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": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-38199",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-38204",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
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                  "type": "CVSS_V3"
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                {
                  "score": "low",
                  "type": "Ubuntu"
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              "id": "CVE-2021-33624",
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                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
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                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-37576",
              "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": "medium",
                  "type": "Ubuntu"
                }
              ]
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              "id": "CVE-2021-38160",
              "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": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-38199",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-38204",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
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                  "type": "CVSS_V3"
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                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
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            {
              "id": "CVE-2021-38204",
              "severity": [
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                  "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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                {
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            }
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                },
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                  "type": "CVSS_V3"
                },
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                }
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              "id": "CVE-2021-37576",
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                },
                {
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                  "type": "Ubuntu"
                }
              ]
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              "id": "CVE-2021-38160",
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                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-38199",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-38204",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-5.4.0-1055-oracle",
            "binary_version": "5.4.0-1055.59"
          },
          {
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        "5.4.0-1038.41",
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        "5.4.0-1042.45",
        "5.4.0-1043.46",
        "5.4.0-1045.49",
        "5.4.0-1046.50",
        "5.4.0-1048.52",
        "5.4.0-1049.53",
        "5.4.0-1052.56",
        "5.4.0-1053.57",
        "5.4.0-1054.58"
      ]
    }
  ],
  "aliases": [],
  "details": "Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk\ndiscovered that the BPF verifier in the Linux kernel missed possible\nmispredicted branches due to type confusion, allowing a side-channel\nattack. An attacker could use this to expose sensitive information.\n(CVE-2021-33624)\n\nIt was discovered that the tracing subsystem in the Linux kernel did not\nproperly keep track of per-cpu ring buffer state. A privileged attacker\ncould use this to cause a denial of service. (CVE-2021-3679)\n\nAlexey Kardashevskiy discovered that the KVM implementation for PowerPC\nsystems in the Linux kernel did not properly validate RTAS arguments in\nsome situations. An attacker in a guest vm could use this to cause a denial\nof service (host OS crash) or possibly execute arbitrary code.\n(CVE-2021-37576)\n\nIt was discovered that the Virtio console implementation in the Linux\nkernel did not properly validate input lengths in some situations. A local\nattacker could possibly use this to cause a denial of service (system\ncrash). (CVE-2021-38160)\n\nMichael Wakabayashi discovered that the NFSv4 client implementation in the\nLinux kernel did not properly order connection setup operations. An\nattacker controlling a remote NFS server could use this to cause a denial\nof service on the client. (CVE-2021-38199)\n\nIt was discovered that the MAX-3421 host USB device driver in the Linux\nkernel did not properly handle device removal events. A physically\nproximate attacker could use this to cause a denial of service (system\ncrash). (CVE-2021-38204)\n",
  "id": "USN-5091-1",
  "modified": "2026-06-03T10:45:26Z",
  "published": "2021-09-28T02:30:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5091-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3679"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-33624"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-37576"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-38160"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-38199"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-38204"
    }
  ],
  "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, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2021-3679",
    "UBUNTU-CVE-2021-33624",
    "UBUNTU-CVE-2021-37576",
    "UBUNTU-CVE-2021-38160",
    "UBUNTU-CVE-2021-38199",
    "UBUNTU-CVE-2021-38204"
  ]
}



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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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