Detections
Analytics

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 19999.44.106

critical Tenable Cloud Security Plugin ID 475551

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: KVM: arm64: Handle negative S1 walk
 levels in VNCR TLB size evaluation Computing the effects of a TLB invalidation involves looking at the
 size of the mapping cached by the TLB. For S1 mappings such as VNCR, this is deducted from the combination
 of the base granule size and the mapping level. However, this implies that the S1 MMU is *on*. When the
 MMU is off, we indicate this with the level being set to a "creative" value of -127 (S1_MMU_DISABLED).
 This ends-up being misinterpreted by pgshift_level_to_ttl() as it doesn't handle negative levels at all
 (the level is immediately cast to a u8 and only the bottom two bits considered), leading to an
 invalidation size of 0. Not helpful. Tidy-up pgshift_level_to_ttl() to handle these negative levels, and
 ttl_to_size() to always return SZ_1G when no valid TTL is present. This allows the removal of open-coded
 checks for similar situations. Note that the check for a negative value not explicitely checking for
 S1_MMU_DISABLED is deliberate, so that actual negative levels introduced with LVA2 and D128 can take the
 same path if we ever support them. (CVE-2026-89775)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 19999.44.106 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-133.oval.xml.tar.gz

Plugin Details

Severity: Critical

ID: 475551

Version: Revision 1.1

Type: Local

Published: 10/16/2026

Updated: 10/16/2026

Risk Information

VPR

Risk Factor: High

Score: 7.7

Percentile: 98.89

Vendor

Vendor Severity: HIGH

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-89775

CVSS v3

Risk Factor: Critical

Base Score: 9.3

Temporal Score: 8.1

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/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: 9/16/2026

Reference Information

CVE: CVE-2026-89775