{"id":"UBUNTU-CVE-2026-88924","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.","modified":"2026-09-16T14:03:21.457270482Z","published":"2026-09-10T15:17:00Z","upstream":["CVE-2026-88924"],"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"}],"affected":[{"package":{"name":"gvfs","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/gvfs?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.24.2-0ubuntu4","1.24.2-0ubuntu5","1.24.2-0ubuntu6","1.26.2-1ubuntu1","1.27.3-1ubuntu1","1.27.4-1ubuntu1","1.27.90-1ubuntu1","1.27.92-1ubuntu1","1.28.1-1ubuntu1","1.28.2-1ubuntu1~16.04.1","1.28.2-1ubuntu1~16.04.2","1.28.2-1ubuntu1~16.04.3"],"ecosystem_specific":{"binaries":[{"binary_name":"gvfs","binary_version":"1.28.2-1ubuntu1~16.04.3"},{"binary_version":"1.28.2-1ubuntu1~16.04.3","binary_name":"gvfs-backends"},{"binary_name":"gvfs-bin","binary_version":"1.28.2-1ubuntu1~16.04.3"},{"binary_version":"1.28.2-1ubuntu1~16.04.3","binary_name":"gvfs-common"},{"binary_name":"gvfs-daemons","binary_version":"1.28.2-1ubuntu1~16.04.3"},{"binary_version":"1.28.2-1ubuntu1~16.04.3","binary_name":"gvfs-fuse"},{"binary_name":"gvfs-libs","binary_version":"1.28.2-1ubuntu1~16.04.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88924.json"}},{"package":{"name":"gvfs","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/gvfs?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.34.1-1ubuntu1","1.34.1-1ubuntu3","1.34.1-1ubuntu4","1.34.1-2ubuntu2","1.35.91-1ubuntu1","1.35.91-1ubuntu2","1.36.0-1ubuntu1","1.36.1-0ubuntu1","1.36.1-0ubuntu1.1","1.36.1-0ubuntu1.2","1.36.1-0ubuntu1.3","1.36.1-0ubuntu1.3.2","1.36.1-0ubuntu1.3.3"],"ecosystem_specific":{"binaries":[{"binary_name":"gvfs","binary_version":"1.36.1-0ubuntu1.3.3"},{"binary_name":"gvfs-backends","binary_version":"1.36.1-0ubuntu1.3.3"},{"binary_version":"1.36.1-0ubuntu1.3.3","binary_name":"gvfs-bin"},{"binary_version":"1.36.1-0ubuntu1.3.3","binary_name":"gvfs-common"},{"binary_version":"1.36.1-0ubuntu1.3.3","binary_name":"gvfs-daemons"},{"binary_name":"gvfs-fuse","binary_version":"1.36.1-0ubuntu1.3.3"},{"binary_version":"1.36.1-0ubuntu1.3.3","binary_name":"gvfs-libs"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88924.json"}},{"package":{"name":"gvfs","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/gvfs?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.42.1-1ubuntu1","1.42.2-1ubuntu3","1.43.90-1ubuntu3","1.43.92-1ubuntu1","1.44.0-1ubuntu1","1.44.1-1ubuntu1","1.44.1-1ubuntu1.1","1.44.1-1ubuntu1.2"],"ecosystem_specific":{"binaries":[{"binary_name":"gvfs","binary_version":"1.44.1-1ubuntu1.2"},{"binary_version":"1.44.1-1ubuntu1.2","binary_name":"gvfs-backends"},{"binary_name":"gvfs-bin","binary_version":"1.44.1-1ubuntu1.2"},{"binary_name":"gvfs-common","binary_version":"1.44.1-1ubuntu1.2"},{"binary_name":"gvfs-daemons","binary_version":"1.44.1-1ubuntu1.2"},{"binary_version":"1.44.1-1ubuntu1.2","binary_name":"gvfs-fuse"},{"binary_version":"1.44.1-1ubuntu1.2","binary_name":"gvfs-libs"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88924.json"}},{"package":{"name":"gvfs","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/gvfs?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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":{"binaries":[{"binary_version":"1.48.2-0ubuntu1.1","binary_name":"gvfs"},{"binary_name":"gvfs-backends","binary_version":"1.48.2-0ubuntu1.1"},{"binary_name":"gvfs-common","binary_version":"1.48.2-0ubuntu1.1"},{"binary_name":"gvfs-daemons","binary_version":"1.48.2-0ubuntu1.1"},{"binary_name":"gvfs-fuse","binary_version":"1.48.2-0ubuntu1.1"},{"binary_name":"gvfs-libs","binary_version":"1.48.2-0ubuntu1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88924.json"}},{"package":{"name":"gvfs","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/gvfs?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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":{"binaries":[{"binary_version":"1.54.4-0ubuntu1~24.04.2","binary_name":"gvfs"},{"binary_name":"gvfs-backends","binary_version":"1.54.4-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