Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_6: security update to 19216.220.99

high Tenable Self-Hosted Container Security Plugin ID 472925

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: bpf: Fix stack-out-of-bounds write in
devmap get_upper_ifindexes() iterates over all upper devices and writes their indices into an array
without checking bounds. Also the callers assume that the max number of upper devices is MAX_NEST_DEV and
allocate excluded_devices[1+MAX_NEST_DEV] on the stack, but that assumption is not correct and the number
of upper devices could be larger than MAX_NEST_DEV (e.g., many macvlans), causing a stack-out-of-bounds
write. Add a max parameter to get_upper_ifindexes() to avoid the issue. When there are too many upper
devices, return -EOVERFLOW and abort the redirect. To reproduce, create more than MAX_NEST_DEV(8) macvlans
on a device with an XDP program attached using BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS. Then send a packet
to the device to trigger the XDP redirect path. (CVE-2026-23359)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.220.99 or later.

Plugin Details

Severity: High

ID: 472925

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/6/2026

Updated: 10/6/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58

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-2026-23359

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: 3/25/2026

Reference Information

CVE: CVE-2026-23359

Detections

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