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Echo: linux: security update to 6.1.170-1

high Tenable Cloud Security Plugin ID 458127

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: fix memory leaks and NULL deref
 in smb2_lock() smb2_lock() has three error handling issues after list_del() detaches smb_lock from
 lock_list at no_check_cl: 1) If vfs_lock_file() returns an unexpected error in the non-UNLOCK path, goto
 out leaks smb_lock and its flock because the out: handler only iterates lock_list and rollback_list,
 neither of which contains the detached smb_lock. 2) If vfs_lock_file() returns -ENOENT in the UNLOCK path,
 goto out leaks smb_lock and flock for the same reason. The error code returned to the dispatcher is also
 stale. 3) In the rollback path, smb_flock_init() can return NULL on allocation failure. The result is
 dereferenced unconditionally, causing a kernel NULL pointer dereference. Add a NULL check to prevent the
 crash and clean up the bookkeeping; the VFS lock itself cannot be rolled back without the allocation and
 will be released at file or connection teardown. Fix cases 1 and 2 by hoisting the
 locks_free_lock()/kfree() to before the if(!rc) check in the UNLOCK branch so all exit paths share one
 free site, and by freeing smb_lock and flock before goto out in the non-UNLOCK branch. Propagate the
 correct error code in both cases. Fix case 3 by wrapping the VFS unlock in an if(rlock) guard and adding a
 NULL check for locks_free_lock(rlock) in the shared cleanup. Found via call-graph analysis using sqry.
 (CVE-2026-31477)

Solution

Update the linux library and its related packages to version 6.1.170-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-31477

Plugin Details

Severity: High

ID: 458127

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.68

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-31477

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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: 4/22/2026

Reference Information

CVE: CVE-2026-31477