Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_12: security update to 19506.505.8

critical Tenable Cloud Security Plugin ID 472689

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: drop the stateid, not the
stateowner, on seqid_op replay retry In nfs4_preprocess_seqid_op() the stateid is obtained from
nfsd4_lookup_stateid(), which holds a reference on the nfs4_stid (sc_count) but takes no reference on the
stateowner. openlockstateid() merely casts that stid and likewise takes no reference. When
nfsd4_cstate_assign_replay() returns -EAGAIN (the replay owner is being torn down, RP_UNHASHED) it has not
taken a stateowner reference on that path. The error handling nevertheless called
nfs4_put_stateowner(stp->st_stateowner), dropping an so_count reference the function never acquired --
risking a stateowner refcount underflow and use-after-free -- while leaking the sc_count reference held on
the stid. The leaked stid reference can also stall a concurrent nfsd4_close_open_stateid() waiting for
sc_count to drop. Drop the reference actually held -- the stid -- before retrying. The stateowner stays
alive through the reference held by the stid. This mirrors the open path in nfsd4_process_open1(), where
the put balances a reference that path explicitly holds on the stateowner. (CVE-2026-89688)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.505.8 or later.

Plugin Details

Severity: Critical

ID: 472689

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/5/2026

Updated: 10/5/2026

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-2026-89688

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-2026-89688

Detections

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