Google: sys-kernel/cchost-kernel-6_12, sys-kernel/cchost-kernel-6_18, sys-kernel/csql-kernel-6_12, sys-kernel/csql-kernel-6_18, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-kernel-6_18, sys-kernel/lakitu-nc-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_18: security update to 19862.0.0

medium Tenable Cloud Security Plugin ID 471023

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/sched: act_mirred: fix wrong
device for mac_header_xmit check in tcf_blockcast_redir In tcf_blockcast_redir(), when iterating block
ports to redirect packets to multiple devices, the mac_header_xmit flag is queried from the wrong device.
The loop sends to dev_prev but queries dev_is_mac_header_xmit(dev) — which is the NEXT device in the
iteration, not the one being sent to. This causes tcf_mirred_to_dev() to make incorrect decisions about
whether to push or pull the MAC header. When the block contains mixed device types (e.g., an ethernet veth
and a tunnel device), intermediate devices get the wrong mac_header_xmit flag, leading to skb header
corruption. In the worst case, skb_push_rcsum with an incorrect mac_len can exhaust headroom and panic.
The last device in the loop is handled correctly (line 365-366 uses dev_is_mac_header_xmit(dev_prev)),
confirming this is a copy-paste oversight for the intermediate devices. Fix by using dev_prev instead of
dev for the mac_header_xmit query, consistent with the device actually being sent to. (CVE-2026-53014)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19862.0.0 or later.

Plugin Details

Severity: Medium

ID: 471023

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: 23.77

Vendor

Vendor Severity: MEDIUM

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-2026-53014

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: 6/22/2026

Reference Information

CVE: CVE-2026-53014

Detections

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