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

high Tenable Cloud Security Plugin ID 471992

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: dm: avoid leaking the caller's thread
keyring via the table device file The refactoring in commit a28d893eb327 ("md: port block device access to
file") accidentally causes the caller's thread keyring to be kept alive long beyond the caller's lifetime.
As a result, "cryptsetup luksSuspend" silently fails to wipe the LUKS volume key from memory. In detail:
"cryptsetup luksOpen" uses its supposedly ephemeral thread keyring to pass the volume key to the kernel.
dm-crypt's crypt_set_keyring_key() copies the key material into its own crypt_config structure and then
drops its own reference to the key in the keyring with key_put(). With this fix, restoring pre-v6.9
behavior, the copy in the thread keyring is then promptly garbage collected, such that exactly one copy of
the volume key remains. This single copy is correctly wiped from memory on "cryptsetup luksSuspend".
Without this fix, the thread keyring and the volume key in it remains. This second copy is only freed on
"luksClose". "luksSuspend" neither knows about this copy nor has any way to remove it, so the key remains
recoverable from RAM after a suspend that is documented to have wiped it. This fix should not introduce
new security problems, as the code is anyway gated by CAP_SYS_ADMIN. The device-mapper core, not the
calling task, is the legitimate owner of this long-lived file. (CVE-2026-72103)

Solution

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

Plugin Details

Severity: High

ID: 471992

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/5/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: High

Score: 7.2

Percentile: 98.34

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2026-72103

CVSS v3

Risk Factor: High

Base Score: 7.3

Temporal Score: 6.4

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 8/11/2026

Reference Information

CVE: CVE-2026-72103

Detections

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