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 Self-Hosted Container Security Plugin ID 475458

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 blocked-lock reaping A bare lock owner -- its only remaining reference a blocked lock on
nn->blocked_locks_lru -- holds a raw pointer to its nfs4_client but no reference keeping the client alive.
When the per-net laundromat reaps such a lock, freeing the nbl drops the owner reference held through
flc_owner, and the final nfs4_put_stateowner() takes the client's cl_lock. Because the laundromat detaches
the nbl first, __destroy_client() no longer finds it, so a concurrent force_expire_client() can free the
client before nfs4_put_stateowner() runs, dereferencing cl_lock in freed memory. Pin the client with
cl_rpc_users before dropping nn->blocked_locks_lock, and skip clients already expiring, whose blocked
locks __destroy_client() frees while holding an owner reference. Take nn->client_lock outside
nn->blocked_locks_lock. Every other site holds nn->blocked_locks_lock as a leaf, acquiring no further
lock, so placing nn->client_lock outside it cannot form a lock-order cycle. (CVE-2026-90036)

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: 475458

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: 58.41

Vendor

Vendor Severity: HIGH

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-2026-90036

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: 9/16/2026

Reference Information

CVE: CVE-2026-90036

Detections

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