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Google: sys-kernel/csql-kernel-6_6: security update to 18867.199.80

medium Tenable Self-Hosted Container Security Plugin ID 452364

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: x86/vmscape: Add conditional IBPB
 mitigation VMSCAPE is a vulnerability that exploits insufficient branch predictor isolation between a
 guest and a userspace hypervisor (like QEMU). Existing mitigations already protect kernel/KVM from a
 malicious guest. Userspace can additionally be protected by flushing the branch predictors after a VMexit.
 Since it is the userspace that consumes the poisoned branch predictors, conditionally issue an IBPB after
 a VMexit and before returning to userspace. Workloads that frequently switch between hypervisor and
 userspace will incur the most overhead from the new IBPB. This new IBPB is not integrated with the
 existing IBPB sites. For instance, a task can use the existing speculation control prctl() to get an IBPB
 at context switch time. With this implementation, the IBPB is doubled up: one at context switch and
 another before running userspace. The intent is to integrate and optimize these cases post-embargo. [
 dhansen: elaborate on suboptimal IBPB solution ] (CVE-2025-40300)

Solution

Update the sys-kernel/csql-kernel-6_6 library and its related packages to version 18867.199.80 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-121.oval.xml.tar.gz

Plugin Details

Severity: Medium

ID: 452364

Version: Revision 1.1

Type: Local

Published: 10/1/2026

Updated: 10/1/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

Percentile: 95.9

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2025-40300

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: 9/11/2025

Reference Information

CVE: CVE-2025-40300