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 20098.0.0

high Tenable Cloud Security Plugin ID 472153

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: io_uring: defer eventfd signaling when
queued from a wakeup handler io_req_local_work_add() signals the CQ ring eventfd inline when it is the one
to push the first entry onto ->work_list. For DEFER_TASKRUN rings that add is frequently done from a
waitqueue wakeup handler, where an arbitrary waitqueue lock is held. eventfd_signal_mask() only refuses to
recurse when current->in_eventfd is set, but that bit is set by eventfd_signal_mask() itself. If the wake
chain starts somewhere else, signal goes out inline and can feed back into epoll. Add IOU_F_TWQ_IN_WAKE,
set it on the task_work add done from the three waitqueue callbacks, and use it to force
io_eventfd_signal() down the existing call_rcu_hurry() deferral instead of signaling inline.
(CVE-2026-80920)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 20098.0.0 or later.

Plugin Details

Severity: High

ID: 472153

Version: Revision 1.2

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/3/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.43

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4

Vector: CVSS2#AV:L/AC:M/Au:N/C:N/I:P/A:C

CVSS Score Source: CVE-2026-80920

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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: 9/9/2026

Reference Information

CVE: CVE-2026-80920

Detections

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