Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12: security update to 19216.395.4

high Tenable Cloud Security Plugin ID 472088

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: net: nexthop: fix percpu use-after-
free in remove_nh_grp_entry When removing a nexthop from a group, remove_nh_grp_entry() publishes the new
group via rcu_assign_pointer() then immediately frees the removed entry's percpu stats with free_percpu().
However, the synchronize_net() grace period in the caller remove_nexthop_from_groups() runs after the
free. RCU readers that entered before the publish still see the old group and can dereference the freed
stats via nh_grp_entry_stats_inc() -> get_cpu_ptr(nhge->stats), causing a use-after-free on percpu memory.
Fix by deferring the free_percpu() until after synchronize_net() in the caller. Removed entries are
chained via nh_list onto a local deferred free list. After the grace period completes and all RCU readers
have finished, the percpu stats are safely freed. (CVE-2026-43374)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.395.4 or later.

Plugin Details

Severity: High

ID: 472088

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.84

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-2026-43374

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: 4/30/2026

Reference Information

CVE: CVE-2026-43374

Detections

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