usn-5597-1
Vulnerability from osv_ubuntu
Published
2022-09-05 21:45
Modified
2026-06-25 10:46
Summary
linux-oracle vulnerability
Details

It was discovered that the virtual terminal driver in the Linux kernel did not properly handle VGA console font changes, leading to an out-of-bounds write. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-33656",
              "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": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "linux-buildinfo-4.15.0-1105-oracle",
            "binary_version": "4.15.0-1105.116~16.04.1"
          },
          {
            "binary_name": "linux-headers-4.15.0-1105-oracle",
            "binary_version": "4.15.0-1105.116~16.04.1"
          },
          {
            "binary_name": "linux-image-unsigned-4.15.0-1105-oracle",
            "binary_version": "4.15.0-1105.116~16.04.1"
          },
          {
            "binary_name": "linux-modules-4.15.0-1105-oracle",
            "binary_version": "4.15.0-1105.116~16.04.1"
          },
          {
            "binary_name": "linux-modules-extra-4.15.0-1105-oracle",
            "binary_version": "4.15.0-1105.116~16.04.1"
          },
          {
            "binary_name": "linux-oracle-headers-4.15.0-1105",
            "binary_version": "4.15.0-1105.116~16.04.1"
          },
          {
            "binary_name": "linux-oracle-tools-4.15.0-1105",
            "binary_version": "4.15.0-1105.116~16.04.1"
          },
          {
            "binary_name": "linux-tools-4.15.0-1105-oracle",
            "binary_version": "4.15.0-1105.116~16.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "linux-oracle",
        "purl": "pkg:deb/ubuntu/linux-oracle@4.15.0-1105.116~16.04.1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.15.0-1105.116~16.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.15.0-1007.9~16.04.1",
        "4.15.0-1008.10~16.04.1",
        "4.15.0-1009.11~16.04.1",
        "4.15.0-1010.12~16.04.1",
        "4.15.0-1011.13~16.04.1",
        "4.15.0-1013.15~16.04.1",
        "4.15.0-1014.16~16.04.1",
        "4.15.0-1015.17~16.04.1",
        "4.15.0-1017.19~16.04.2",
        "4.15.0-1018.20~16.04.1",
        "4.15.0-1021.23~16.04.1",
        "4.15.0-1022.25~16.04.1",
        "4.15.0-1023.26~16.04.1",
        "4.15.0-1025.28~16.04.1",
        "4.15.0-1026.29~16.04.1",
        "4.15.0-1027.30~16.04.1",
        "4.15.0-1029.32~16.04.1",
        "4.15.0-1030.33~16.04.1",
        "4.15.0-1031.34~16.04.1",
        "4.15.0-1033.36~16.04.1",
        "4.15.0-1035.38~16.04.1",
        "4.15.0-1037.41~16.04.1",
        "4.15.0-1038.42~16.04.1",
        "4.15.0-1039.43~16.04.1",
        "4.15.0-1045.49~16.04.1",
        "4.15.0-1046.50~16.04.1",
        "4.15.0-1050.54~16.04.1",
        "4.15.0-1051.55~16.04.1",
        "4.15.0-1053.57~16.04.1",
        "4.15.0-1054.58~16.04.1",
        "4.15.0-1056.61~16.04.1",
        "4.15.0-1058.64~16.04.1",
        "4.15.0-1059.65~16.04.1",
        "4.15.0-1061.67~16.04.1",
        "4.15.0-1062.68~16.04.1",
        "4.15.0-1064.71~16.04.1",
        "4.15.0-1065.73~16.04.1",
        "4.15.0-1066.74~16.04.1",
        "4.15.0-1067.75~16.04.1",
        "4.15.0-1068.76~16.04.1",
        "4.15.0-1069.77~16.04.1",
        "4.15.0-1070.78~16.04.1",
        "4.15.0-1071.79~16.04.1",
        "4.15.0-1072.80~16.04.1",
        "4.15.0-1075.83~16.04.1",
        "4.15.0-1078.86~16.04.1",
        "4.15.0-1079.87~16.04.1",
        "4.15.0-1080.88~16.04.1",
        "4.15.0-1081.89~16.04.1",
        "4.15.0-1082.90~16.04.1",
        "4.15.0-1083.91~16.04.1",
        "4.15.0-1084.92~16.04.1",
        "4.15.0-1085.93~16.04.1",
        "4.15.0-1086.94~16.04.1",
        "4.15.0-1087.95~16.04.1",
        "4.15.0-1089.98~16.04.1",
        "4.15.0-1090.99~16.04.1",
        "4.15.0-1091.100~16.04.1",
        "4.15.0-1092.101~16.04.1",
        "4.15.0-1093.102~16.04.1",
        "4.15.0-1095.104~16.04.1",
        "4.15.0-1098.108~16.04.1",
        "4.15.0-1101.112~16.04.1",
        "4.15.0-1102.113~16.04.1",
        "4.15.0-1104.115~16.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that the virtual terminal driver in the Linux kernel did\nnot properly handle VGA console font changes, leading to an out-of-bounds\nwrite. A local attacker could use this to cause a denial of service (system\ncrash) or possibly execute arbitrary code.\n",
  "id": "USN-5597-1",
  "modified": "2026-06-25T10:46:07Z",
  "published": "2022-09-05T21:45:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5597-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-33656"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux-oracle vulnerability",
  "upstream": [
    "UBUNTU-CVE-2021-33656"
  ]
}



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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

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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.


Detection rules are retrieved from Rulezet.