Google: sys-kernel/cchost-kernel-6_18, sys-kernel/csql-kernel-6_18, sys-kernel/lakitu-kernel-6_18, sys-kernel/lakitu-nc-kernel-6_18: security update to 19999.44.106

high Tenable Self-Hosted Container Security Plugin ID 475438

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: cifs: clear tcon after
cifsFileInfo_put() in cifs_file_set_size() When the else branch of cifs_file_set_size() finds a writable
file handle via find_writable_file(), it borrows tcon and server from the handle's tlink, attempts the
handle-based set_file_size() RPC, and then releases the handle with cifsFileInfo_put(). If set_file_size()
fails, execution falls through to the path-based fallback, which reuses the borrowed tcon and server under
the "if (tcon == NULL)" guard. Since tcon is not NULL at that point, the guard is skipped. If
cifsFileInfo_put() dropped the last reference on a tlink that was already removed from the tlink tree
(TCON_LINK_IN_TREE cleared, as happens during reconnection or session teardown), cifs_put_tlink() will
have freed tcon; the subsequent set_path_size() call is then a use-after-free. Setting tcon = NULL after
cifsFileInfo_put() causes the existing guard to take the cifs_sb_tlink() path, which acquires a fresh
reference for the path-based operation or fails cleanly if the session is gone. (CVE-2026-89641)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 19999.44.106 or later.

Plugin Details

Severity: High

ID: 475438

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/16/2026

Updated: 10/16/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.22

Vendor

Vendor Severity: LOW

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-2026-89641

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

Vulnerability Publication Date: 9/11/2026

Reference Information

CVE: CVE-2026-89641

Detections

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