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Echo: linux: security update to 6.12.85-1

high Tenable Cloud Security Plugin ID 459975

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - In the Linux kernel, the following vulnerability has been resolved: landlock: Fix handling of disconnected
 directories Disconnected files or directories can appear when they are visible and opened from a bind
 mount, but have been renamed or moved from the source of the bind mount in a way that makes them
 inaccessible from the mount point (i.e. out of scope). Previously, access rights tied to files or
 directories opened through a disconnected directory were collected by walking the related hierarchy down
 to the root of the filesystem, without taking into account the mount point because it couldn't be found.
 This could lead to inconsistent access results, potential access right widening, and hard-to-debug
 renames, especially since such paths cannot be printed. For a sandboxed task to create a disconnected
 directory, it needs to have write access (i.e. FS_MAKE_REG, FS_REMOVE_FILE, and FS_REFER) to the
 underlying source of the bind mount, and read access to the related mount point. Because a sandboxed task
 cannot acquire more access rights than those defined by its Landlock domain, this could lead to
 inconsistent access rights due to missing permissions that should be inherited from the mount point
 hierarchy, while inheriting permissions from the filesystem hierarchy hidden by this mount point instead.
 Landlock now handles files and directories opened from disconnected directories by taking into account the
 filesystem hierarchy when the mount point is not found in the hierarchy walk, and also always taking into
 account the mount point from which these disconnected directories were opened. This ensures that a rename
 is not allowed if it would widen access rights [1]. The rationale is that, even if disconnected
 hierarchies might not be visible or accessible to a sandboxed task, relying on the collected access rights
 from them improves the guarantee that access rights will not be widened during a rename because of the
 access right comparison between the source and the destination (see LANDLOCK_ACCESS_FS_REFER). It may look
 like this would grant more access on disconnected files and directories, but the security policies are
 always enforced for all the evaluated hierarchies. This new behavior should be less surprising to users
 and safer from an access control perspective. Remove a wrong WARN_ON_ONCE() canary in
 collect_domain_accesses() and fix the related comment. Because opened files have their access rights
 stored in the related file security properties, there is no impact for disconnected or unlinked files.
 (CVE-2025-68736)

Solution

Update the linux library and its related packages to version 6.12.85-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-68736

Plugin Details

Severity: High

ID: 459975

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: High

Score: 7

Percentile: 98.22

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2025-68736

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 12/24/2025

Vulnerability Publication Date: 12/24/2025

Reference Information

CVE: CVE-2025-68736