{"id":"CVE-2026-111581","title":"Libblockdev: libblockdev: argument injection in ntfs/vfat label-setting helpers via udisks2 setlabel() d-bus method","summary":"A flaw was found in libblockdev. The bd_fs_ntfs_set_label() and bd_fs_vfat_set_label() functions pass caller-supplied label values as bare positional arguments to the ntfslabel and fatlabel utilities without end-of-options separators or …","severity":"low","cvss":3.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cvssSource":"cna","cwe":["CWE-88"],"vendor":"Red Hat","product":"libblockdev","affected":["libblockdev (all versions)","libblockdev (all versions)","libblockdev (all versions)","libblockdev (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T16:32:08.637542Z"},"published":"2026-10-16","updated":"2026-10-16","sourceUpdated":"2026-10-16T17:06:09.524Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111581","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-111581"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554104","label":"RHBZ#2554104"}],"tags":["cve.org"],"ingestedAt":"2026-10-16T18:43:08.841Z","slug":"CVE-2026-111581","body":"## Overview\n\nA flaw was found in libblockdev. The bd_fs_ntfs_set_label() and bd_fs_vfat_set_label() functions pass caller-supplied label values as bare positional arguments to the ntfslabel and fatlabel utilities without end-of-options separators or input validation for values beginning with a dash. This allows a label starting with '-' to be interpreted as a command-line flag by the spawned tool, potentially bypassing safety checks or causing unintended operations. This is reachable by unprivileged local users through the udisks2 Filesystem.SetLabel() D-Bus method without administrator authentication.\n\n## Affected\n\n- `libblockdev (all versions)`\n- `libblockdev (all versions)`\n- `libblockdev (all versions)`\n- `libblockdev (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nThere is no practical mitigation that does not affect normal desktop functionality. Restricting the polkit policy for org.freedesktop.udisks2.modify-device to require administrator authentication (changing allow_active from \"yes\" to \"auth_admin\") would block the attack surface but would also require a password for all legitimate filesystem label and UUID operations on user-owned devices.","depth":"sunlit","depthScore":18,"depthScoreParts":{"impact":18.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}