Google: sys-kernel/cchost-kernel-6_18, sys-kernel/csql-kernel-6_18, sys-kernel/lakitu-kernel-6_18, sys-kernel/lakitu-nc-kernel-6_18: security update to 20085.0.0

medium Tenable Cloud Security Plugin ID 471512

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: cdrom: fix stack out-of-bounds read in
CDROMVOLCTRL mmc_ioctl_cdrom_volume() first reads the audio control mode page into a 32-byte stack buffer
with cgc->buflen set to 24. If the device reports a block descriptor, the function increases cgc->buflen
to include that descriptor and reads the page again. For CDROMVOLCTRL, the function then builds a MODE
SELECT parameter list by moving cgc->buffer forward by offset - 8 bytes. This drops the block descriptor
from the outgoing payload and leaves a new 8-byte mode parameter header in front of the audio control
page. However, cgc->buflen is left unchanged. With a standard 8-byte block descriptor, cgc->buffer points
at buffer + 8 but cgc->buflen remains 32. cdrom_mode_select() therefore asks the low level packet path to
write 32 bytes from that adjusted pointer, reading 8 bytes past the end of the 32-byte stack buffer. This
is not hit by CDROMVOLREAD, and CDROMVOLCTRL only triggers it on drives that return a non-zero block
descriptor length, which helps explain why it has gone unnoticed. The overread is also sent to the device
as extra MODE SELECT payload, so it may not produce an obvious local failure. Reduce cgc->buflen by the
same amount as the buffer pointer adjustment so the MODE SELECT transfer covers only the intended
parameter list. (CVE-2026-68184)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 20085.0.0 or later.

Plugin Details

Severity: Medium

ID: 471512

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: Medium

Score: 5

Percentile: 93.3

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Low

Base Score: 1

Temporal Score: 0.7

Vector: CVSS2#AV:L/AC:H/Au:S/C:P/I:N/A:N

CVSS Score Source: CVE-2026-68184

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: 8/10/2026

Reference Information

CVE: CVE-2026-68184

Detections

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