ECHO-3EB2-A6D4-7B02 The detached-tree X-mount.subdir path arrived in 2.42 (ae19f7546); our libmount has no AT_SYMLINK_NOFOLLOW, no api->subdir in hook_mount.c and no 6.15 logic. Upstream shipped 2.41.6 the same day as 2.42.3 with the other three CVEs and deliberately not this one. Debian marks trixie vulnerable but also bookworm 2.38.1, which predates the path entirely. https://security-tracker.debian.org/tracker/CVE-2026-78409
| Reporter | Title | Published | Views | Family All 26 |
|---|---|---|---|---|
 | CVE-2026-78409 | 2 Sep 202615:11 | – | alpinelinux |
 | CVE-2026-78409 | 7 Sep 202602:01 | – | circl |
 | CVE-2026-78409 | 2 Sep 202615:11 | – | cve |
 | CVE-2026-78409 Util-linux: util-linux: x-mount.subdir detached-tree resolution can escape via intermediate symlinks | 2 Sep 202615:11 | – | cvelist |
 | CVE-2026-78409 | 2 Sep 202615:11 | – | debiancve |
 | EUVD-2026-70107 | 2 Sep 202615:11 | – | euvd |
 | CVE-2026-78409 | 2 Sep 202616:17 | – | nvd |
 | ALPINE-CVE-2026-78409 | 2 Sep 202616:17 | – | osv |
| BELL-CVE-2026-78409 | 5 Sep 202606:06 | – | osv |
| DEBIAN-CVE-2026-78409 | 2 Sep 202616:17 | – | osv |
10
| Source | Link |
|---|---|
| advisory | www.advisory.echohq.com/cve/CVE-2026-78409 |
| advisory | www.advisory.echohq.com/cve/CVE-2026-78409 |
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06 Sep 2026 09:45Current
5.6Medium risk
Vulners AI Score5.6
CVSS 3.17
EPSS0.00154
SSVC