CVE-2026-78409
CVE CVE-2026-78409EUVD EUVD-2026-70107Published 2026-09-02T15:11:47.000ZLast changed 2026-09-03T12:50:56.000ZCVSS 7.0
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Red Hat — Red Hat Enterprise Linux 10
- Red Hat — Red Hat Enterprise Linux 7
- Red Hat — Red Hat Enterprise Linux 8
- Red Hat — Red Hat Enterprise Linux 9
- Red Hat — Red Hat Hardened Images patch: 2.42.2-3.4.hum1
- Red Hat — Red Hat OpenShift Container Platform 4
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Red Hat — Red Hat Enterprise Linux
- Red Hat — Red Hat OpenShift Container Platform
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