7

CVE-2026-78409

Util-linux: util-linux: x-mount.subdir detached-tree resolution can escape via intermediate symlinks

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerRed Hat
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Produkt Red Hat Hardened Images
Default Statusaffected
Version 2.42.2-3.4.hum1
Version < *
Status unaffected
HerstellerRed Hat
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Produkt Red Hat Enterprise Linux 10
Default Statusunaffected
HerstellerRed Hat
≫
Produkt Red Hat Enterprise Linux 7
Default Statusunaffected
HerstellerRed Hat
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Produkt Red Hat Enterprise Linux 8
Default Statusunaffected
HerstellerRed Hat
≫
Produkt Red Hat Enterprise Linux 9
Default Statusunaffected
HerstellerRed Hat
≫
Produkt Red Hat Enterprise Linux 9
Default Statusunaffected
HerstellerRed Hat
≫
Produkt Red Hat Enterprise Linux 9
Default Statusunaffected
HerstellerRed Hat
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Produkt Red Hat OpenShift Container Platform 4
Default Statusunaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.12% 0.024
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
RedHat 7 1 5.9
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-59 Improper Link Resolution Before File Access ('Link Following')

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

https://access.redhat.com/security/cve/CVE-2026-78409
https://bugzilla.redhat.com/show_bug.cgi?id=2522607
https://github.com/util-linux/util-linux/security/advisories/GHSA-8f2p-47x3-43mv
https://access.redhat.com/errata/RHSA-2026:63162