UBUNTU-CVE-2026-88924 (CVE-2026-88924)

Vulnerability from osv_ubuntu – Published: 2026-09-10 15:17 – Updated: 2026-10-01 03:32 – Source website
VLAI
Details

A flaw was found in the admin backend of gvfs. The privileged gvfsd-admin daemon changes the ownership of newly created private D-Bus sockets by calling the link-following chown() function on a pathname inside a user-controlled directory. A local attacker can exploit this via a Time-of-Check Time-of-Use (TOCTOU) race condition and exchange the socket pathname with a symbolic link pointing to an arbitrary root-owned file (such as /etc/pam.d/su). The daemon subsequently follows the symlink and changes the ownership of the targeted root-owned file to the attacker's user ID. This allows an authenticated local attacker to modify critical system files, leading to a full local privilege escalation to root.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "gvfs",
            "binary_version": "1.48.2-0ubuntu1.2"
          },
          {
            "binary_name": "gvfs-backends",
            "binary_version": "1.48.2-0ubuntu1.2"
          },
          {
            "binary_name": "gvfs-common",
            "binary_version": "1.48.2-0ubuntu1.2"
          },
          {
            "binary_name": "gvfs-daemons",
            "binary_version": "1.48.2-0ubuntu1.2"
          },
          {
            "binary_name": "gvfs-fuse",
            "binary_version": "1.48.2-0ubuntu1.2"
          },
          {
            "binary_name": "gvfs-libs",
            "binary_version": "1.48.2-0ubuntu1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "gvfs",
        "purl": "pkg:deb/ubuntu/gvfs@1.48.2-0ubuntu1.2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.48.2-0ubuntu1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.47.91-1ubuntu1",
        "1.48.1-2ubuntu2",
        "1.48.1-2ubuntu3",
        "1.48.1-2ubuntu5",
        "1.48.1-3",
        "1.48.1-4",
        "1.48.2-0ubuntu1",
        "1.48.2-0ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "gvfs",
            "binary_version": "1.54.4-0ubuntu1~24.04.4"
          },
          {
            "binary_name": "gvfs-backends",
            "binary_version": "1.54.4-0ubuntu1~24.04.4"
          },
          {
            "binary_name": "gvfs-common",
            "binary_version": "1.54.4-0ubuntu1~24.04.4"
          },
          {
            "binary_name": "gvfs-daemons",
            "binary_version": "1.54.4-0ubuntu1~24.04.4"
          },
          {
            "binary_name": "gvfs-fuse",
            "binary_version": "1.54.4-0ubuntu1~24.04.4"
          },
          {
            "binary_name": "gvfs-libs",
            "binary_version": "1.54.4-0ubuntu1~24.04.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "gvfs",
        "purl": "pkg:deb/ubuntu/gvfs@1.54.4-0ubuntu1~24.04.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.54.4-0ubuntu1~24.04.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.52.0-1",
        "1.52.1-1build1",
        "1.52.2-1",
        "1.53.90-2",
        "1.54.0-1build1",
        "1.54.0-1build2",
        "1.54.0-1build3",
        "1.54.0-1ubuntu2",
        "1.54.4-0ubuntu1~24.04.1",
        "1.54.4-0ubuntu1~24.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "gvfs",
            "binary_version": "1.60.0-1ubuntu0.1"
          },
          {
            "binary_name": "gvfs-backends",
            "binary_version": "1.60.0-1ubuntu0.1"
          },
          {
            "binary_name": "gvfs-common",
            "binary_version": "1.60.0-1ubuntu0.1"
          },
          {
            "binary_name": "gvfs-daemons",
            "binary_version": "1.60.0-1ubuntu0.1"
          },
          {
            "binary_name": "gvfs-fuse",
            "binary_version": "1.60.0-1ubuntu0.1"
          },
          {
            "binary_name": "gvfs-libs",
            "binary_version": "1.60.0-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "gvfs",
        "purl": "pkg:deb/ubuntu/gvfs@1.60.0-1ubuntu0.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.60.0-1ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.57.2-2ubuntu5",
        "1.57.2-2ubuntu6",
        "1.58.0-1ubuntu1",
        "1.58.0-2",
        "1.59.1-1",
        "1.59.90-3",
        "1.60.0-1"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in the admin backend of gvfs. The privileged gvfsd-admin daemon changes the ownership of newly created private D-Bus sockets by calling the link-following chown() function on a pathname inside a user-controlled directory. A local attacker can exploit this via a Time-of-Check Time-of-Use (TOCTOU) race condition and exchange the socket pathname with a symbolic link pointing to an arbitrary root-owned file (such as /etc/pam.d/su). The daemon subsequently follows the symlink and changes the ownership of the targeted root-owned file to the attacker\u0027s user ID. This allows an authenticated local attacker to modify critical system files, leading to a full local privilege escalation to root.",
  "id": "UBUNTU-CVE-2026-88924",
  "modified": "2026-10-01T03:32:18Z",
  "published": "2026-09-10T15:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-88924"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-88924"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.gnome.org/GNOME/gvfs/-/issues/875"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.gnome.org/GNOME/gvfs/-/merge_requests/352"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8845-1"
    }
  ],
  "related": [
    "USN-8845-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "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"
    }
  ],
  "upstream": [
    "CVE-2026-88924"
  ]
}



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