ALPINE-CVE-2026-78409
ALPINE-CVE-2026-78409
This page contains facts from public vulnerability sources. Check the original advisory before updating.
The X-mount.subdir option uses a detached-tree fast path on Linux 6.15 and later and passes the configured subdirectory to open_tree() with AT_SYMLINK_NOFOLLOW. That flag does not stop intermediate symlink traversal or keep resolution inside the newly mounted filesystem. A local unprivileged user with an fstab-authorized X-mount.subdir entry can attach a host path at the intended mountpoint.
CVSS 7.0 · High · Fix available
- Published
- Updated
Stack: system
Affected products and versions
util-linux Alpine:v3.24
- Affected ranges
- ECOSYSTEM: < 2.42.3-r0
Update to 2.42.3-r0