Google: sys-kernel/csql-kernel-6_1, sys-kernel/csql-kernel-6_6, sys-kernel/lakitu-kernel-6_1, sys-kernel/lakitu-kernel-6_6, sys-kernel/lakitu-nc-kernel-6_6, sys-kernel/lakitu-vgpu-kernel-6_6, sys-kernel/tpusev-kernel-6_6: security update to 18613.675.48

high Tenable Self-Hosted Container Security Plugin ID 465762

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: resolve SWN tcon from
live registrations cifs_swn_notify() looks up a witness registration by id under cifs_swnreg_idr_mutex,
drops the mutex, and then uses the registration's cached tcon pointer. That pointer is not a lifetime
reference, and it is not a stable representative once cifs_get_swn_reg() lets multiple tcons for the same
net/share name share one registration id. A same-share second mount can keep the cifs_swn_reg alive after
the first tcon unregisters and is freed. The registration then still points at the freed first tcon, so
taking tc_lock or incrementing tc_count through swnreg->tcon only moves the use-after-free earlier. Taking
tc_lock while holding cifs_swnreg_idr_mutex also violates the documented CIFS lock order. Fix this by
making the registration store only the stable witness identity: id, net name, share name, and notify
flags. When a notify arrives, copy that identity under cifs_swnreg_idr_mutex, drop the mutex, then find
and pin a live witness tcon that currently matches the net/share pair under the normal cifs_tcp_ses_lock
-> tc_lock order. The notification path uses that pinned tcon directly and drops the reference when done.
Registration and unregister messages now use the live tcon passed by the caller instead of a cached tcon
in the registration. The final unregister send is folded into cifs_swn_unregister() while the registration
is still protected by cifs_swnreg_idr_mutex. This removes the previous find/drop/reacquire raw-pointer
window. The release path only removes the idr entry and frees the stable identity strings. This preserves
the intended one-registration/many-tcon behavior: a registration id represents a net/share pair, and
notify handling acts on a live representative selected at use time. It also preserves CLIENT_MOVE ordering
for the representative tcon because the old-IP unregister is sent before cifs_swn_register() sends the
new-IP register. (CVE-2026-64401)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18613.675.48 or later.

Plugin Details

Severity: High

ID: 465762

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/2/2026

Updated: 10/3/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.27

Vendor

Vendor Severity: HIGH

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-2026-64401

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: 7/25/2026

Reference Information

CVE: CVE-2026-64401

Detections

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