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
- Published
- 2026-09-02T16:17:23Z
- Modified
- 2026-09-16T22:00:06Z
- 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:12 / util-linux
Package
- Name
- util-linux
- Purl
- pkg:deb/debian/util-linux?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Affected versions
2.*
2.38.1-5
2.38.1-5+deb12u1
2.38.1-5+deb12u2
2.38.1-5+deb12u3
2.38.1-5+loong64
2.38.1-6
2.39.1-1
2.39.1-2
2.39.1-3
2.39.1-4
2.39.2-1
2.39.2-2
2.39.2-2.1
2.39.2-2.2
2.39.2-3
2.39.2-4
2.39.2-5
2.39.2-6
2.39.3-1
2.39.3-2
2.39.3-3
2.39.3-4
2.39.3-5
2.39.3-6
2.39.3-6.1~exp1
2.39.3-6.1
2.39.3-7
2.39.3-8
2.39.3-9
2.39.3-10
2.39.3-11
2.40~rc2-1
2.40~rc2-2
2.40~rc2-3
2.40~rc2-4
2.40~rc2-5
2.40~rc2-6
2.40~rc2-7
2.40~rc2-8
2.40-1
2.40-2
2.40-3
2.40-4
2.40-5
2.40-6
2.40-7
2.40-8
2.40.1-1
2.40.1-2
2.40.1-3
2.40.1-4
2.40.1-4+hurd.1
2.40.1-6
2.40.1-7
2.40.1-8
2.40.1-8.1
2.40.1-9
2.40.2-1
2.40.2-2
2.40.2-3
2.40.2-4
2.40.2-5
2.40.2-6
2.40.2-7
2.40.2-8
2.40.2-9
2.40.2-10
2.40.2-11
2.40.2-12
2.40.2-12+hurd.1
2.40.2-13
2.40.2-14
2.40.3-1
2.40.4-1
2.40.4-2
2.40.4-3
2.40.4-4
2.40.4-5
2.41~rc1-1
2.41~rc1-2
2.41~rc2-1
2.41-1
2.41-2
2.41-3
2.41-4
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
2.42.3-1
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
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