Detections
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Echo: linux: security update to 6.1.176-1

high Tenable Cloud Security Plugin ID 457794

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: ksmbd: require 3 sub-authorities
 before reading sub_auth[2] parse_dacl() compares each ACE SID against sid_unix_NFS_mode and on match reads
 sid.sub_auth[2] as the file mode. If sid_unix_NFS_mode is the prefix S-1-5-88-3 with num_subauth = 2 then
 compare_sids() compares only min(num_subauth, 2) sub-authorities so a client SID with num_subauth = 2 and
 sub_auth = {88, 3} will match. If num_subauth = 2 and the ACE is placed at the very end of the security
 descriptor, sub_auth[2] will be 4 bytes past end_of_acl. The out-of-band bytes will then be masked to the
 low 9 bits and applied as the file's POSIX mode, probably not something that is good to have happen. Fix
 this up by forcing the SID to actually carry a third sub-authority before reading it at all.
 (CVE-2026-31611)

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-2026-31611

Plugin Details

Severity: High

ID: 457794

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3.9

Percentile: 52.71

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-31611

CVSS v3

Risk Factor: High

Base Score: 8.6

Temporal Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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: 5/1/2026

Vulnerability Publication Date: 4/24/2026

Reference Information

CVE: CVE-2026-31611