usn-4318-1
Vulnerability from osv_ubuntu
Published
2020-04-06 20:29
Modified
2026-06-03 10:45
Summary
linux, linux-hwe vulnerabilities
Details

Al Viro discovered that the vfs layer in the Linux kernel contained a use- after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-8428)

Gustavo Romero and Paul Mackerras discovered that the KVM implementation in the Linux kernel for PowerPC processors did not properly keep guest state separate from host state. A local attacker in a KVM guest could use this to cause a denial of service (host system crash). (CVE-2020-8834)

Shijie Luo discovered that the ext4 file system implementation in the Linux kernel did not properly check for a too-large journal size. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (soft lockup). (CVE-2020-8992)


{
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              "id": "CVE-2020-8428",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-8834",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-8992",
              "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"
                }
              ]
            }
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        }
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                  "type": "CVSS_V3"
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  ],
  "aliases": [],
  "details": "Al Viro discovered that the vfs layer in the Linux kernel contained a use-\nafter-free vulnerability. A local attacker could use this to cause a denial\nof service (system crash) or possibly expose sensitive information (kernel\nmemory). (CVE-2020-8428)\n\nGustavo Romero and Paul Mackerras discovered that the KVM implementation in\nthe Linux kernel for PowerPC processors did not properly keep guest state\nseparate from host state. A local attacker in a KVM guest could use this to\ncause a denial of service (host system crash). (CVE-2020-8834)\n\nShijie Luo discovered that the ext4 file system implementation in the Linux\nkernel did not properly check for a too-large journal size. An attacker\ncould use this to construct a malicious ext4 image that, when mounted,\ncould cause a denial of service (soft lockup). (CVE-2020-8992)\n",
  "id": "USN-4318-1",
  "modified": "2026-06-03T10:45:21Z",
  "published": "2020-04-06T20:29:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4318-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-8428"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-8834"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-8992"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux, linux-hwe vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2020-8428",
    "UBUNTU-CVE-2020-8834",
    "UBUNTU-CVE-2020-8992"
  ]
}



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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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