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 20162.0.0

critical Tenable Self-Hosted Container Security Plugin ID 475794

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: NFSD: Prevent client use-after-free
during admin state revocation A stateid holds only a bare pointer to its nfs4_client; a stateid reference
does not pin it. The client survives only because __destroy_client() drains its stateids before
free_client() runs. nfsd4_revoke_states() drops nn->client_lock across revoke_one_stid(), which
dereferences the client to revoke a stateid and read clp->cl_minorversion. A teardown racing the dropped
lock can free the client first. Pinning cl_rpc_users under client_lock blocks the DESTROY_CLIENTID and
EXCHANGE_ID teardown, which refuses while cl_rpc_users is non-zero. force_expire_client() ignores it: once
its wait for cl_rpc_users to reach zero has passed, a later pin goes unnoticed. Under client_lock, skip a
client whose cl_time is already zero -- force_expire_client() clears it there before waiting -- otherwise
pin cl_rpc_users before dropping the lock. The walk then either sees the expiry and skips, or pins in time
for that wait to cover the revoke. (CVE-2026-89660)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 20162.0.0 or later.

Plugin Details

Severity: Critical

ID: 475794

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: 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-2026-89660

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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-2026-89660

Detections

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