usn-5591-2
Vulnerability from osv_ubuntu
Published
2022-09-01 17:21
Modified
2026-06-25 10:46
Summary
linux-aws-hwe 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-aws-headers-4.15.0-1140",
            "binary_version": "4.15.0-1140.151~16.04.1"
          },
          {
            "binary_name": "linux-aws-hwe-cloud-tools-4.15.0-1140",
            "binary_version": "4.15.0-1140.151~16.04.1"
          },
          {
            "binary_name": "linux-aws-hwe-tools-4.15.0-1140",
            "binary_version": "4.15.0-1140.151~16.04.1"
          },
          {
            "binary_name": "linux-buildinfo-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151~16.04.1"
          },
          {
            "binary_name": "linux-cloud-tools-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151~16.04.1"
          },
          {
            "binary_name": "linux-headers-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151~16.04.1"
          },
          {
            "binary_name": "linux-image-unsigned-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151~16.04.1"
          },
          {
            "binary_name": "linux-modules-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151~16.04.1"
          },
          {
            "binary_name": "linux-modules-extra-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151~16.04.1"
          },
          {
            "binary_name": "linux-tools-4.15.0-1140-aws",
            "binary_version": "4.15.0-1140.151~16.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "linux-aws-hwe",
        "purl": "pkg:deb/ubuntu/linux-aws-hwe@4.15.0-1140.151~16.04.1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.15.0-1140.151~16.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.15.0-1030.31~16.04.1",
        "4.15.0-1031.33~16.04.1",
        "4.15.0-1032.34~16.04.1",
        "4.15.0-1033.35~16.04.1",
        "4.15.0-1035.37~16.04.1",
        "4.15.0-1036.38~16.04.1",
        "4.15.0-1039.41~16.04.1",
        "4.15.0-1040.42~16.04.1",
        "4.15.0-1041.43~16.04.1",
        "4.15.0-1043.45~16.04.1",
        "4.15.0-1044.46~16.04.1",
        "4.15.0-1045.47~16.04.1",
        "4.15.0-1047.49~16.04.1",
        "4.15.0-1048.50~16.04.1",
        "4.15.0-1050.52~16.04.1",
        "4.15.0-1051.53~16.04.1",
        "4.15.0-1052.54~16.04.1",
        "4.15.0-1054.56~16.04.1",
        "4.15.0-1056.58~16.04.1",
        "4.15.0-1057.59~16.04.1",
        "4.15.0-1058.60~16.04.1",
        "4.15.0-1060.62~16.04.1",
        "4.15.0-1063.67~16.04.1",
        "4.15.0-1065.69~16.04.1",
        "4.15.0-1066.70~16.04.1",
        "4.15.0-1067.71~16.04.1",
        "4.15.0-1073.77~16.04.1",
        "4.15.0-1074.78~16.04.1",
        "4.15.0-1079.83~16.04.1",
        "4.15.0-1080.84~16.04.1",
        "4.15.0-1082.86~16.04.1",
        "4.15.0-1083.87~16.04.1",
        "4.15.0-1085.90~16.04.1",
        "4.15.0-1088.93~16.04.1",
        "4.15.0-1090.95~16.04.1",
        "4.15.0-1091.96~16.04.1",
        "4.15.0-1093.99~16.04.1",
        "4.15.0-1094.101~16.04.1",
        "4.15.0-1095.102~16.04.1",
        "4.15.0-1096.103~16.04.1",
        "4.15.0-1097.104~16.04.1",
        "4.15.0-1098.105~16.04.1",
        "4.15.0-1099.106~16.04.1",
        "4.15.0-1102.109~16.04.1",
        "4.15.0-1103.110~16.04.1",
        "4.15.0-1106.113~16.04.1",
        "4.15.0-1109.116~16.04.1",
        "4.15.0-1110.117~16.04.1",
        "4.15.0-1111.118~16.04.1",
        "4.15.0-1112.119~16.04.1",
        "4.15.0-1113.120~16.04.1",
        "4.15.0-1115.122~16.04.1",
        "4.15.0-1116.123~16.04.1",
        "4.15.0-1118.125~16.04.1",
        "4.15.0-1119.126~16.04.2",
        "4.15.0-1120.128~16.04.1",
        "4.15.0-1123.132~16.04.1",
        "4.15.0-1124.133~16.04.1",
        "4.15.0-1126.135~16.04.2",
        "4.15.0-1127.136~16.04.1",
        "4.15.0-1128.137~16.04.1",
        "4.15.0-1130.139~16.04.1",
        "4.15.0-1133.143~16.04.1",
        "4.15.0-1136.147~16.04.1",
        "4.15.0-1137.148~16.04.1",
        "4.15.0-1139.150~16.04.1"
      ]
    }
  ],
  "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-5591-2",
  "modified": "2026-06-25T10:46:07Z",
  "published": "2022-09-01T17:21:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5591-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-33656"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux-aws-hwe 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.