Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12, sys-kernel/csql-kernel-6_6, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-kernel-6_6, sys-kernel/lakitu-nc-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_6, sys-kernel/lakitu-vgpu-kernel-6_6: security update to 19216.532.96

high Tenable Cloud Security Plugin ID 468827

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: perf/core: Detach event groups during
remove_on_exec perf_event_remove_on_exec() removes events by calling perf_event_exit_event(). For top-
level events, this removes the event from the context with DETACH_EXIT only. This can leave inconsistent
group state when a removed event is a group leader and the group contains siblings without remove_on_exec.
If the group was active, the surviving siblings can remain active and attached to the removed leader's
sibling list, but are no longer represented by a valid group leader on the PMU context active lists. A
later close of the removed leader uses DETACH_GROUP and can promote the still-active siblings from this
stale group state. The next schedule-in can then add an already-linked active_list entry again, corrupting
the PMU context active list. With DEBUG_LIST enabled, this is caught as a list_add double-add in
merge_sched_in(). Fix this by detaching group relationships when remove_on_exec removes an event. This
preserves the existing task-exit and revoke behavior, while ensuring surviving siblings are ungrouped
before the removed event leaves the context. (CVE-2026-64556)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.532.96 or later.

Plugin Details

Severity: High

ID: 468827

Version: Revision 1.5

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/6/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.29

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-64556

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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: 7/23/2026

Reference Information

CVE: CVE-2026-64556

Detections

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