ubuntu-cve-2021-3982
Vulnerability from osv_ubuntu
Published
2022-04-29 17:15
Modified
2025-09-08 16:46
Summary
Details

Linux distributions using CAP_SYS_NICE for gnome-shell may be exposed to a privilege escalation issue. An attacker, with low privilege permissions, may take advantage of the way CAP_SYS_NICE is currently implemented and eventually load code to increase its process scheduler priority leading to possible DoS of other services running in the same machine.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gnome-shell",
            "binary_version": "3.18.5-0ubuntu0.3+esm1"
          },
          {
            "binary_name": "gnome-shell-common",
            "binary_version": "3.18.5-0ubuntu0.3+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "gnome-shell",
        "purl": "pkg:deb/ubuntu/gnome-shell@3.18.5-0ubuntu0.3+esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.16.4-0ubuntu1",
        "3.18.1-1ubuntu1",
        "3.18.2-0ubuntu1",
        "3.18.2-0ubuntu2",
        "3.18.3-3ubuntu1",
        "3.18.4-0ubuntu1",
        "3.18.4-0ubuntu2",
        "3.18.4-0ubuntu3",
        "3.18.5-0ubuntu0.1",
        "3.18.5-0ubuntu0.2",
        "3.18.5-0ubuntu0.3",
        "3.18.5-0ubuntu0.3+esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "Linux distributions using CAP_SYS_NICE for gnome-shell may be exposed to a privilege escalation issue. An attacker, with low privilege permissions, may take advantage of the way CAP_SYS_NICE is currently implemented and eventually load code to increase its process scheduler priority leading to possible DoS of other services running in the same machine.",
  "id": "UBUNTU-CVE-2021-3982",
  "modified": "2025-09-08T16:46:50Z",
  "published": "2022-04-29T17:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3982"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-3982"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "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": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-3982"
  ]
}



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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.