USN-5141-1 (UBUNTU-CVE-2021-26910)

Vulnerability from osv_ubuntu – Published: 2021-11-11 07:52 – Updated: 2026-04-27 14:11 – Source website
VLAI
Summary
firejail vulnerability
Details

Roman Fiedler discovered that a race condition existed in Firejail when using OverlayFS to prevent writes to the underlying file system. A local attacker could use this to gain administrative privileges. Note: this update disables support for OverlayFS in Firejail.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-26910",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "firejail",
            "binary_version": "0.9.62-3ubuntu0.1"
          },
          {
            "binary_name": "firejail-profiles",
            "binary_version": "0.9.62-3ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "firejail",
        "purl": "pkg:deb/ubuntu/firejail@0.9.62-3ubuntu0.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.62-3ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.60-2",
        "0.9.62-1",
        "0.9.62-2",
        "0.9.62-3"
      ]
    }
  ],
  "aliases": [],
  "details": "Roman Fiedler discovered that a race condition existed in Firejail\nwhen using OverlayFS to prevent writes to the underlying file system. A\nlocal attacker could use this to gain administrative privileges. Note:\nthis update disables support for OverlayFS in Firejail.\n",
  "id": "USN-5141-1",
  "modified": "2026-04-27T14:11:27Z",
  "published": "2021-11-11T07:52:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5141-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-26910"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "firejail vulnerability",
  "upstream": [
    "UBUNTU-CVE-2021-26910"
  ]
}



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