CVE-2026-76642 — util-linux libmount Privilege Escalation via Failed Mount Helper
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 operation…
Published: 2026-09-03 · CVSS: 8.5 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7