usn-5591-4
Vulnerability from osv_ubuntu
Published
2022-09-02 22:27
Modified
2026-06-03 10:45
Summary
linux-aws 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:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "linux-aws-cloud-tools-4.15.0-1140",
            "binary_version": "4.15.0-1140.151"
          },
          {
            "binary_name": "linux-aws-headers-4.15.0-1140",
            "binary_version": "4.15.0-1140.151"
          },
          {
            "binary_name": "linux-aws-tools-4.15.0-1140",
            "binary_version": "4.15.0-1140.151"
          },
          {
            "binary_name": "linux-buildinfo-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151"
          },
          {
            "binary_name": "linux-cloud-tools-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151"
          },
          {
            "binary_name": "linux-headers-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151"
          },
          {
            "binary_name": "linux-image-unsigned-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151"
          },
          {
            "binary_name": "linux-modules-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151"
          },
          {
            "binary_name": "linux-modules-extra-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151"
          },
          {
            "binary_name": "linux-tools-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "linux-aws",
        "purl": "pkg:deb/ubuntu/linux-aws@4.15.0-1140.151?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.15.0-1140.151"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.15.0-1001.1",
        "4.15.0-1003.3",
        "4.15.0-1005.5",
        "4.15.0-1006.6",
        "4.15.0-1007.7",
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        "4.15.0-1101.108",
        "4.15.0-1102.109",
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        "4.15.0-1106.113",
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        "4.15.0-1111.118",
        "4.15.0-1112.119",
        "4.15.0-1114.121",
        "4.15.0-1115.122",
        "4.15.0-1116.123",
        "4.15.0-1118.125",
        "4.15.0-1119.127",
        "4.15.0-1121.129",
        "4.15.0-1123.132",
        "4.15.0-1124.133",
        "4.15.0-1126.135",
        "4.15.0-1127.136",
        "4.15.0-1128.137",
        "4.15.0-1130.139",
        "4.15.0-1133.143",
        "4.15.0-1136.147",
        "4.15.0-1137.148",
        "4.15.0-1139.150"
      ]
    }
  ],
  "aliases": [],
  "details": "\nIt 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-5591-4",
  "modified": "2026-06-03T10:45:29Z",
  "published": "2022-09-02T22:27:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5591-4"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-33656"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux-aws 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.