CVE-2026-72034

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-72034

Key Details

CVE	CVE-2026-72034
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

fhandle: reject detached mounts in capable_wrt_mount()

The recent fhandle RCU fix moved the mount namespace capability check

into capable_wrt_mount(), so a non-NULL mnt_namespace survives the

ns_capable() dereference. The helper still assumes the later

READ_ONCE(mount->mnt_ns) must be non-NULL because may_decode_fh()

checked is_mounted() first.

That assumption is not stable. A detached mount from

open_tree(..., OPEN_TREE_CLONE) can be dissolved on fput while

open_by_handle_at() is between those checks, and umount_tree() can

clear mount->mnt_ns. If the helper observes NULL, it dereferences

mnt_ns->user_ns and panics.

Return false when the RCU read observes a detached mount. This keeps

the relaxed permission path conservative: a mount no longer attached

to a namespace cannot authorize open_by_handle_at() access. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-72034
CVE	https://www.cve.org/CVERecord?id=CVE-2026-72034

Source

Reference

NVD

CVE