CVEvulnerability

CVE-2026-78409

7.0 HIGH Published 2026-09-02 Modified 2026-10-21 Official page ↗
Status
Awaiting Analysis
Published
2026-09-02
Last modified
2026-10-21
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.0 HIGH — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-59

Description

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.

Related

Weakness · CWE (1)

  • CWE-59 Improper Link Resolution Before File Access weakness

References