ubuntu-cve-2026-4897
Vulnerability from osv_ubuntu
Published
2026-03-26 15:16
Modified
2026-04-22 07:57
Summary
Details

A flaw was found in polkit. A local user can exploit this by providing a specially crafted, excessively long input to the polkit-agent-helper-1 setuid binary via standard input (stdin). This unbounded input can lead to an out-of-memory (OOM) condition, resulting in a Denial of Service (DoS) for the system.

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": "gir1.2-polkit-1.0",
            "binary_version": "0.105-4ubuntu3.14.04.6+esm1"
          },
          {
            "binary_name": "libpolkit-agent-1-0",
            "binary_version": "0.105-4ubuntu3.14.04.6+esm1"
          },
          {
            "binary_name": "libpolkit-backend-1-0",
            "binary_version": "0.105-4ubuntu3.14.04.6+esm1"
          },
          {
            "binary_name": "libpolkit-gobject-1-0",
            "binary_version": "0.105-4ubuntu3.14.04.6+esm1"
          },
          {
            "binary_name": "policykit-1",
            "binary_version": "0.105-4ubuntu3.14.04.6+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "policykit-1",
        "purl": "pkg:deb/ubuntu/policykit-1@0.105-4ubuntu3.14.04.6+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.105-3ubuntu3",
        "0.105-4ubuntu1",
        "0.105-4ubuntu2",
        "0.105-4ubuntu2.14.04.1",
        "0.105-4ubuntu3.14.04.1",
        "0.105-4ubuntu3.14.04.2",
        "0.105-4ubuntu3.14.04.5",
        "0.105-4ubuntu3.14.04.6",
        "0.105-4ubuntu3.14.04.6+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gir1.2-polkit-1.0",
            "binary_version": "0.105-14.1ubuntu0.5+esm1"
          },
          {
            "binary_name": "libpolkit-agent-1-0",
            "binary_version": "0.105-14.1ubuntu0.5+esm1"
          },
          {
            "binary_name": "libpolkit-backend-1-0",
            "binary_version": "0.105-14.1ubuntu0.5+esm1"
          },
          {
            "binary_name": "libpolkit-gobject-1-0",
            "binary_version": "0.105-14.1ubuntu0.5+esm1"
          },
          {
            "binary_name": "policykit-1",
            "binary_version": "0.105-14.1ubuntu0.5+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "policykit-1",
        "purl": "pkg:deb/ubuntu/policykit-1@0.105-14.1ubuntu0.5+esm1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.105-11ubuntu2",
        "0.105-13",
        "0.105-13ubuntu1",
        "0.105-14",
        "0.105-14.1",
        "0.105-14.1ubuntu0.1",
        "0.105-14.1ubuntu0.4",
        "0.105-14.1ubuntu0.5",
        "0.105-14.1ubuntu0.5+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gir1.2-polkit-1.0",
            "binary_version": "0.105-20ubuntu0.18.04.6"
          },
          {
            "binary_name": "libpolkit-agent-1-0",
            "binary_version": "0.105-20ubuntu0.18.04.6"
          },
          {
            "binary_name": "libpolkit-backend-1-0",
            "binary_version": "0.105-20ubuntu0.18.04.6"
          },
          {
            "binary_name": "libpolkit-gobject-1-0",
            "binary_version": "0.105-20ubuntu0.18.04.6"
          },
          {
            "binary_name": "policykit-1",
            "binary_version": "0.105-20ubuntu0.18.04.6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "policykit-1",
        "purl": "pkg:deb/ubuntu/policykit-1@0.105-20ubuntu0.18.04.6?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.105-18",
        "0.105-20",
        "0.105-20ubuntu0.18.04.1",
        "0.105-20ubuntu0.18.04.4",
        "0.105-20ubuntu0.18.04.5",
        "0.105-20ubuntu0.18.04.6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gir1.2-polkit-1.0",
            "binary_version": "0.105-26ubuntu1.3"
          },
          {
            "binary_name": "libpolkit-agent-1-0",
            "binary_version": "0.105-26ubuntu1.3"
          },
          {
            "binary_name": "libpolkit-gobject-1-0",
            "binary_version": "0.105-26ubuntu1.3"
          },
          {
            "binary_name": "policykit-1",
            "binary_version": "0.105-26ubuntu1.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "policykit-1",
        "purl": "pkg:deb/ubuntu/policykit-1@0.105-26ubuntu1.3?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.105-26ubuntu1",
        "0.105-26ubuntu1.1",
        "0.105-26ubuntu1.2",
        "0.105-26ubuntu1.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "gir1.2-polkit-1.0",
            "binary_version": "0.105-33ubuntu0.1"
          },
          {
            "binary_name": "libpolkit-agent-1-0",
            "binary_version": "0.105-33ubuntu0.1"
          },
          {
            "binary_name": "libpolkit-gobject-1-0",
            "binary_version": "0.105-33ubuntu0.1"
          },
          {
            "binary_name": "pkexec",
            "binary_version": "0.105-33ubuntu0.1"
          },
          {
            "binary_name": "policykit-1",
            "binary_version": "0.105-33ubuntu0.1"
          },
          {
            "binary_name": "polkitd",
            "binary_version": "0.105-33ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "policykit-1",
        "purl": "pkg:deb/ubuntu/policykit-1@0.105-33ubuntu0.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.105-33ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.105-31",
        "0.105-31ubuntu1",
        "0.105-31.1",
        "0.105-32",
        "0.105-33"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "gir1.2-polkit-1.0",
            "binary_version": "124-2ubuntu1.24.04.3"
          },
          {
            "binary_name": "libpolkit-agent-1-0",
            "binary_version": "124-2ubuntu1.24.04.3"
          },
          {
            "binary_name": "libpolkit-gobject-1-0",
            "binary_version": "124-2ubuntu1.24.04.3"
          },
          {
            "binary_name": "pkexec",
            "binary_version": "124-2ubuntu1.24.04.3"
          },
          {
            "binary_name": "policykit-1",
            "binary_version": "124-2ubuntu1.24.04.3"
          },
          {
            "binary_name": "polkitd",
            "binary_version": "124-2ubuntu1.24.04.3"
          },
          {
            "binary_name": "polkitd-pkla",
            "binary_version": "124-2ubuntu1.24.04.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "policykit-1",
        "purl": "pkg:deb/ubuntu/policykit-1@124-2ubuntu1.24.04.3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "124-2ubuntu1.24.04.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "123-1",
        "123-3",
        "124-1",
        "124-1ubuntu1",
        "124-2ubuntu1",
        "124-2ubuntu1.24.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "gir1.2-polkit-1.0",
            "binary_version": "126-2ubuntu0.1"
          },
          {
            "binary_name": "libpolkit-agent-1-0",
            "binary_version": "126-2ubuntu0.1"
          },
          {
            "binary_name": "libpolkit-gobject-1-0",
            "binary_version": "126-2ubuntu0.1"
          },
          {
            "binary_name": "pkexec",
            "binary_version": "126-2ubuntu0.1"
          },
          {
            "binary_name": "polkitd",
            "binary_version": "126-2ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "policykit-1",
        "purl": "pkg:deb/ubuntu/policykit-1@126-2ubuntu0.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "126-2ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "126-2"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in polkit. A local user can exploit this by providing a specially crafted, excessively long input to the `polkit-agent-helper-1` setuid binary via standard input (stdin). This unbounded input can lead to an out-of-memory (OOM) condition, resulting in a Denial of Service (DoS) for the system.",
  "id": "UBUNTU-CVE-2026-4897",
  "modified": "2026-04-22T07:57:44Z",
  "published": "2026-03-26T15:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-4897"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-4897"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-4897"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8173-1"
    }
  ],
  "related": [
    "USN-8173-1"
  ],
  "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-2026-4897"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.