Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12: security update to 19506.120.44

high Tenable Self-Hosted Container Security Plugin ID 468934

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: xfrm: prevent policy_hthresh.work from
racing with netns teardown A XFRM_MSG_NEWSPDINFO request can queue the per-net work item
policy_hthresh.work onto the system workqueue. The queued callback, xfrm_hash_rebuild(), retrieves the
enclosing struct net via container_of(). If the net namespace is torn down before that work runs, the
associated struct net may already have been freed, and xfrm_hash_rebuild() may then dereference stale
memory. xfrm_policy_fini() already flushes policy_hash_work during teardown, but it does not synchronize
policy_hthresh.work. Synchronize policy_hthresh.work in xfrm_policy_fini() as well, so the queued work
cannot outlive the net namespace teardown and access a freed struct net. (CVE-2026-31516)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.120.44 or later.

Plugin Details

Severity: High

ID: 468934

Version: Revision 1.3

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: 57.96

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-2026-31516

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: 4/22/2026

Reference Information

CVE: CVE-2026-31516

Detections

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