usn-4708-1
Vulnerability from osv_ubuntu
Published
2021-01-28 07:09
Modified
2026-06-03 10:45
Summary
linux, linux-lts-xenial vulnerabilities
Details

Wen Xu discovered that the XFS filesystem implementation in the Linux kernel did not properly track inode validations. An attacker could use this to construct a malicious XFS image that, when mounted, could cause a denial of service (system crash). (CVE-2018-13093)

It was discovered that the btrfs file system implementation in the Linux kernel did not properly validate file system metadata in some situations. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service (system crash). (CVE-2019-19813, CVE-2019-19816)

Bodong Zhao discovered a use-after-free in the Sun keyboard driver implementation in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2020-25669)

Daniel Axtens discovered that PowerPC RTAS implementation in the Linux kernel did not properly restrict memory accesses in some situations. A privileged local attacker could use this to arbitrarily modify kernel memory, potentially bypassing kernel lockdown restrictions. (CVE-2020-27777)


{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2018-13093",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2019-19813",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2019-19816",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-25669",
              "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-2020-27777",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
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  ],
  "aliases": [],
  "details": "Wen Xu discovered that the XFS filesystem implementation in the Linux\nkernel did not properly track inode validations. An attacker could use this\nto construct a malicious XFS image that, when mounted, could cause a denial\nof service (system crash). (CVE-2018-13093)\n\nIt was discovered that the btrfs file system implementation in the Linux\nkernel did not properly validate file system metadata in some situations.\nAn attacker could use this to construct a malicious btrfs image that, when\nmounted, could cause a denial of service (system crash). (CVE-2019-19813,\nCVE-2019-19816)\n\nBodong Zhao discovered a use-after-free in the Sun keyboard driver\nimplementation in the Linux kernel. A local attacker could use this to\ncause a denial of service or possibly execute arbitrary code.\n(CVE-2020-25669)\n\nDaniel Axtens discovered that PowerPC RTAS implementation in the Linux\nkernel did not properly restrict memory accesses in some situations. A\nprivileged local attacker could use this to arbitrarily modify kernel\nmemory, potentially bypassing kernel lockdown restrictions.\n(CVE-2020-27777)\n",
  "id": "USN-4708-1",
  "modified": "2026-06-03T10:45:24Z",
  "published": "2021-01-28T07:09:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4708-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-13093"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2019-19813"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2019-19816"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-25669"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-27777"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux, linux-lts-xenial vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2018-13093",
    "UBUNTU-CVE-2019-19813",
    "UBUNTU-CVE-2019-19816",
    "UBUNTU-CVE-2020-25669",
    "UBUNTU-CVE-2020-27777"
  ]
}



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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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