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 19506.120.97

medium Tenable Self-Hosted Container Security Plugin ID 469128

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: x86/apic: Disable x2apic on resume if
the kernel expects so When resuming from s2ram, firmware may re-enable x2apic mode, which may have been
disabled by the kernel during boot either because it doesn't support IRQ remapping or for other reasons.
This causes the kernel to continue using the xapic interface, while the hardware is in x2apic mode, which
causes hangs. This happens on defconfig + bare metal + s2ram. Fix this in lapic_resume() by disabling
x2apic if the kernel expects it to be disabled, i.e. when x2apic_mode = 0. The ACPI v6.6 spec, Section
16.3 [1] says firmware restores either the pre-sleep configuration or initial boot configuration for each
CPU, including MSR state: When executing from the power-on reset vector as a result of waking from an S2
or S3 sleep state, the platform firmware performs only the hardware initialization required to restore the
system to either the state the platform was in prior to the initial operating system boot, or to the pre-
sleep configuration state. In multiprocessor systems, non-boot processors should be placed in the same
state as prior to the initial operating system boot. (further ahead) If this is an S2 or S3 wake, then the
platform runtime firmware restores minimum context of the system before jumping to the waking vector. This
includes: CPU configuration. Platform runtime firmware restores the pre-sleep configuration or initial
boot configuration of each CPU (MSR, MTRR, firmware update, SMBase, and so on). Interrupts must be
disabled (for IA-32 processors, disabled by CLI instruction). (and other things) So at least as per the
spec, re-enablement of x2apic by the firmware is allowed if "x2apic on" is a part of the initial boot
configuration. [1] https://uefi.org/specs/ACPI/6.6/16_Waking_and_Sleeping.html#initialization [ bp:
Massage. ] (CVE-2026-43363)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.120.97 or later.

Plugin Details

Severity: Medium

ID: 469128

Version: Revision 1.3

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: Low

Score: 3

Percentile: 23.58

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2026-43363

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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: 4/23/2026

Reference Information

CVE: CVE-2026-43363

Detections

Analytics