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Echo: linux: security update to 6.1.176-1

high Tenable Self-Hosted Container Security Plugin ID 459778

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: smb: client: validate the whole DACL
 before rewriting it in cifsacl build_sec_desc() and id_mode_to_cifs_acl() derive a DACL pointer from a
 server-supplied dacloffset and then use the incoming ACL to rebuild the chmod/chown security descriptor.
 The original fix only checked that the struct smb_acl header fits before reading dacl_ptr->size or
 dacl_ptr->num_aces. That avoids the immediate header-field OOB read, but the rewrite helpers still walk
 ACEs based on pdacl->num_aces with no structural validation of the incoming DACL body. A malicious server
 can return a truncated DACL that still contains a header, claims one or more ACEs, and then drive
 replace_sids_and_copy_aces() or set_chmod_dacl() past the validated extent while they compare or copy
 attacker-controlled ACEs. Factor the DACL structural checks into validate_dacl(), extend them to validate
 each ACE against the DACL bounds, and use the shared validator before the chmod/chown rebuild paths.
 parse_dacl() reuses the same validator so the read-side parser and write-side rewrite paths agree on what
 constitutes a well-formed incoming DACL. (CVE-2026-31709)

Solution

Update the linux library and its related packages to version 6.1.176-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-31709

Plugin Details

Severity: High

ID: 459778

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.35

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-31709

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/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: 5/8/2026

Vulnerability Publication Date: 5/1/2026

Reference Information

CVE: CVE-2026-31709