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 19999.44.28

medium Tenable Self-Hosted Container Security Plugin ID 469901

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: futex: Avoid private hash use-after-
free on final put futex_private_hash_put() drops the reference to fph before evaluating fph->mm for
wake_up_var(). futex_ref_put() enables preemption again before returning. If that put drops the final
reference and the task is preempted, another task can pivot to the replacement hash and free the old hash
after an RCU grace period. The first task then reads fph->mm from the freed allocation when it resumes.
KASAN reports a slab-use-after-free in futex_private_hash_put(), with the read at offset 24 in a freed
kmalloc-512 allocation. The allocation and free stacks point to futex_hash_allocate() and the RCU free
path, respectively. Load the mm pointer while the fph reference is still held and pass the saved value to
wake_up_var(). wake_up_var() uses the pointer as a waitqueue key and does not dereference the mm through
it. (CVE-2026-80758)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 19999.44.28 or later.

Plugin Details

Severity: Medium

ID: 469901

Version: Revision 1.6

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: Low

Score: 3

Percentile: 23.67

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-80758

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: 9/4/2026

Reference Information

CVE: CVE-2026-80758

Detections

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