DEBIAN-CVE-2026-78409
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-78409
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-78409.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-78409
- Upstream
- CVE-2026-78409
- Published
- 2026-09-02T16:17:23Z
- Modified
- 2026-11-05T09:47:29Z
- Severity
-
- 7.0 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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.
- References
Affected packages
Debian:13 / util-linux
Package
- Name
- util-linux
- Purl
- pkg:deb/debian/util-linux?arch=source&distro=trixie
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Affected versions
2.*
2.41-5
2.41.1-1
2.41.1-2
2.41.1-3
2.41.1-4
2.41.2-1
2.41.2-2
2.41.2-3
2.41.2-4
2.41.3-1
2.41.3-2
2.41.3-3
2.41.3-4
2.41.5-0+deb13u1
2.42~rc1-1
2.42~rc1-2
2.42~rc1-3
2.42~rc2-1
2.42-1
2.42-2
2.42-3
2.42-4
2.42-5
2.42-6
2.42.1-1
2.42.1-2
2.42.1-3
2.42.1-4
2.42.1-5
2.42.1-6
2.42.2-1
2.42.2-2
2.42.2-3
2.42.2-4
2.42.3-1
2.42.4-1
Debian:14 / util-linux
Package
- Name
- util-linux
- Purl
- pkg:deb/debian/util-linux?arch=source&distro=forky
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed2.42.3-1
Affected versions
2.*
2.41-5
2.41.1-1
2.41.1-2
2.41.1-3
2.41.1-4
2.41.2-1
2.41.2-2
2.41.2-3
2.41.2-4
2.41.3-1
2.41.3-2
2.41.3-3
2.41.3-4
2.42~rc1-1
2.42~rc1-2
2.42~rc1-3
2.42~rc2-1
2.42-1
2.42-2
2.42-3
2.42-4
2.42-5
2.42-6
2.42.1-1
2.42.1-2
2.42.1-3
2.42.1-4
2.42.1-5
2.42.1-6
2.42.2-1
2.42.2-2
2.42.2-3
2.42.2-4