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 475582

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: restart ssc_expire_umount walk
after dropping nfsd_ssc_lock nfsd4_ssc_expire_umount() walks nn->nfsd_ssc_mount_list with
list_for_each_entry_safe(ni, tmp, ...). For each expired entry it sets nsui_busy = true, drops
nfsd_ssc_lock to run mntput() on the source vfsmount, then reacquires the lock to list_del + kfree the
entry and continue iterating via the macro's saved tmp pointer. The nsui_busy flag protects the current ni
from concurrent nfsd4_ssc_setup_dul() finders during the lock-drop window, but it does not pin tmp.
Another nfsd RPC thread that fails its source- server mount and reaches nfsd4_ssc_cancel_dul() will,
during that same window, take nfsd_ssc_lock, list_del + kfree its own ssc_umount item, and release the
lock. If that item is the saved tmp of the expire walk, the next iteration dereferences a freed
nfsd4_ssc_umount_item. Restart the walk from the head after the mntput() unlock window so no saved next
pointer survives the lock-drop. The list is bounded by the number of active inter-server source mounts
(typically small) and the expire delayed-work runs periodically rather than per-IO, so the restart is
cheap. (CVE-2026-89712)

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: 475582

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: 58.42

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-2026-89712

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-2026-89712

Detections

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