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 19862.0.0

medium Tenable Cloud Security Plugin ID 469988

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: iommu/vt-d: Avoid NULL pointer
dereference or refcount corruption Commit 60f030f7418d ("iommu/vt-d: Avoid use of NULL after
WARN_ON_ONCE") fixed a NULL pointer dereference in an unlikely situation partly. If dev_pasid is not found
in the dev_pasids list, it remains NULL. However, the teardown operations are executed unconditionally,
this lead to a NULL pointer dereference or refcount corruption. If the domain was never attached to this
IOMMU, info will be NULL, which would cause an immediate dereference when checking --info->refcnt. Even if
info is not NULL, decrementing the refcount without having removed a valid PASID might unbalance the
count. This could lead to premature dropping of the refcount to 0, potentially causing a use-after-free
for the remaining active devices sharing the domain. Fix it by returning early if dev_pasid is NULL,
before executing the teardown operations. Issue found by AI review and suggested by Kevin Tian.
https://sashiko.dev/#/patchset/20260421031347.1408890-1-zhenzhong.duan%40intel.com (CVE-2026-53281)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 19862.0.0 or later.

Plugin Details

Severity: Medium

ID: 469988

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: 23.78

Vendor

Vendor Severity: HIGH

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-2026-53281

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-2026-53281

Detections

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