Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12: security update to 19506.0.98

medium Tenable Self-Hosted Container Security Plugin ID 472520

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: gro: fix outer network offset The
udp GRO complete stage assumes that all the packets inserted the RX have the `encapsulation` flag zeroed.
Such assumption is not true, as a few H/W NICs can set such flag when H/W offloading the checksum for an
UDP encapsulated traffic, the tun driver can inject GSO packets with UDP encapsulation and the problematic
layout can also be created via a veth based setup. Due to the above, in the problematic scenarios,
udp4_gro_complete() uses the wrong network offset (inner instead of outer) to compute the outer UDP header
pseudo checksum, leading to csum validation errors later on in packet processing. Address the issue always
clearing the encapsulation flag at GRO completion time. Such flag will be set again as needed for
encapsulated packets by udp_gro_complete(). (CVE-2026-23254)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.0.98 or later.

Plugin Details

Severity: Medium

ID: 472520

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

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-2026-23254

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: 3/18/2026

Reference Information

CVE: CVE-2026-23254

Detections

Analytics