usn-4910-1
Vulnerability from osv_ubuntu
Published
2021-04-13 20:41
Modified
2026-06-03 10:45
Summary
linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities
Details

Ryota Shiga discovered that the sockopt BPF hooks in the Linux kernel could allow a user space program to probe for valid kernel addresses. A local attacker could use this to ease exploitation of another kernel vulnerability. (CVE-2021-20239)

It was discovered that the BPF verifier in the Linux kernel did not properly handle signed add32 and sub integer overflows. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-20268)

It was discovered that the priority inheritance futex implementation in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-3347)

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)

吴异 discovered that the NFS implementation in the Linux kernel did not properly prevent access outside of an NFS export that is a subdirectory of a file system. An attacker could possibly use this to bypass NFS access restrictions. (CVE-2021-3178)


{
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        "cves_map": {
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            {
              "id": "CVE-2021-3178",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "negligible",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-3347",
              "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": "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-2021-3348",
              "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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              "severity": [
                {
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                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
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                }
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            {
              "id": "CVE-2021-20268",
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                },
                {
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            "binary_name": "vlan-modules-5.8.0-49-generic-lpae-di",
            "binary_version": "5.8.0-49.55~20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "linux-hwe-5.8",
        "purl": "pkg:deb/ubuntu/linux-hwe-5.8@5.8.0-49.55~20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.8.0-49.55~20.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.8.0-23.24~20.04.1",
        "5.8.0-25.26~20.04.1",
        "5.8.0-28.30~20.04.1",
        "5.8.0-29.31~20.04.1",
        "5.8.0-31.33~20.04.1",
        "5.8.0-33.36~20.04.1",
        "5.8.0-34.37~20.04.2",
        "5.8.0-36.40~20.04.1",
        "5.8.0-38.43~20.04.1",
        "5.8.0-40.45~20.04.1",
        "5.8.0-41.46~20.04.1",
        "5.8.0-43.49~20.04.1",
        "5.8.0-44.50~20.04.1",
        "5.8.0-45.51~20.04.1",
        "5.8.0-48.54~20.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "Ryota Shiga discovered that the sockopt BPF hooks in the Linux kernel could\nallow a user space program to probe for valid kernel addresses. A local\nattacker could use this to ease exploitation of another kernel\nvulnerability. (CVE-2021-20239)\n\nIt was discovered that the BPF verifier in the Linux kernel did not\nproperly handle signed add32 and sub integer overflows. A local attacker\ncould use this to cause a denial of service (system crash) or possibly\nexecute arbitrary code. (CVE-2021-20268)\n\nIt was discovered that the priority inheritance futex implementation in the\nLinux kernel contained a race condition, leading to a use-after-free\nvulnerability. A local attacker could use this to cause a denial of service\n(system crash) or possibly execute arbitrary code. (CVE-2021-3347)\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\n\u5434\u5f02 discovered that the NFS implementation in the Linux kernel did not\nproperly prevent access outside of an NFS export that is a subdirectory of\na file system. An attacker could possibly use this to bypass NFS access\nrestrictions. (CVE-2021-3178)\n",
  "id": "USN-4910-1",
  "modified": "2026-06-03T10:45:25Z",
  "published": "2021-04-13T20:41:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4910-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3178"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3347"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3348"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-20239"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-20268"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2021-3178",
    "UBUNTU-CVE-2021-3347",
    "UBUNTU-CVE-2021-3348",
    "UBUNTU-CVE-2021-20239",
    "UBUNTU-CVE-2021-20268"
  ]
}



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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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