Google: sys-kernel/cchost-kernel-6_12, sys-kernel/cchost-kernel-6_18, sys-kernel/csql-kernel-6_12, sys-kernel/csql-kernel-6_18, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-kernel-6_18, sys-kernel/lakitu-nc-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_18: security update to 19999.44.106

critical Tenable Cloud Security Plugin ID 475540

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 delegation revoke A delegation stateid holds only a bare pointer to its owning nfs4_client and does
not keep it alive. The client survives its stateids only because __destroy_client() drains cl_delegations
and cl_revoked before free_client() runs. nfs4_laundromat() breaks that invariant: it unhashes an expired
delegation from cl_delegations, drops deleg_lock, then revoke_delegation() relinks it onto cl_revoked
under cl_lock. In that window the delegation is on neither list, so client_has_state() can report no
remaining state. Every teardown path first requires cl_rpc_users to be zero, but the laundromat holds no
such reference. A client whose recalled delegation has just timed out can therefore reach free_client()
while revoke_delegation() is still about to dereference cl_lock, a use-after-free. Pin the client with
cl_rpc_users across the revoke so teardown blocks until it completes, then reap the delegation from
cl_revoked. A client already expiring reaps its own, so skip it and leave the delegation on
del_recall_lru. (CVE-2026-89659)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19999.44.106 or later.

Plugin Details

Severity: Critical

ID: 475540

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: 58.23

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-2026-89659

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-2026-89659

Detections

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