{"id":"CVE-2026-76642","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-76642","summary":"util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on…","details":"util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.","published":"2026-09-03T13:06:08.440","modified":"2026-09-03T13:06:08.440","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/util-linux/util-linux/commit/1d14676ea70003e9f5b2a6a76af0cadb1190411a","label":"util-linux/util-linux@1d14676"},"references":[{"type":"WEB","url":"https://github.com/util-linux/util-linux"},{"type":"WEB","url":"https://github.com/util-linux/util-linux/blob/v2.42.2/libmount/src/context_mount.c#L476"},{"type":"WEB","url":"https://github.com/util-linux/util-linux/blob/v2.42.2/libmount/src/context_mount.c#L892"},{"type":"WEB","url":"https://github.com/util-linux/util-linux/commit/1d14676ea70003e9f5b2a6a76af0cadb1190411a"},{"type":"WEB","url":"https://github.com/util-linux/util-linux/commit/a15c00a9e545aa8b9cf6ec0f888ff6c7b3eaeedc"},{"type":"WEB","url":"https://github.com/util-linux/util-linux/commit/f57cea130839c0af8dc0525274267ae4cfd66bbf"},{"type":"WEB","url":"https://github.com/util-linux/util-linux/security/advisories/GHSA-m25x-3hj9-m26f"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/util-linux-libmount-privilege-escalation-via-failed-mount-helper"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-03T13:06:08.440"}}