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 20198.0.0

medium Tenable Cloud Security Plugin ID 475535

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: perf/x86/intel: Prevent drain_pebs()
 reentry The PEBS buffer is shared by all events on a CPU, so drain_pebs() must not be reentered. If so,
 one instance may observe stale buffer state and potentially access out-of-bound memory. Most invocations
 happen in NMI context, which naturally prevents reentry. However, drain_pebs() is also reachable from
 process context via intel_pmu_drain_pebs_buffer(). In those paths, the PMU is often already disabled, but
 not guaranteed. For example, __intel_pmu_pebs_disable() only disables the target counter, so other active
 counters can still raise a PMI and interrupt an in-flight drain_pebs(). Here is an example,
 __perf_addr_filters_adjust() perf_event_stop() __perf_event_stop() x86_pmu_stop() (event->pmu->stop)
 intel_pmu_disable_event() intel_pmu_pebs_disable() __intel_pmu_pebs_disable() intel_pmu_drain_large_pebs()
 intel_pmu_drain_pebs_buffer() Introduce __intel_pmu_quiesce() and __intel_pmu_resume() helpers and use
 them in intel_pmu_drain_large_pebs() to disable the full PMU around the intel_pmu_drain_pebs_buffer()
 call, preventing reentry. Also add a warning in intel_pmu_drain_pebs_buffer() when the full PMU is not
 disabled. (CVE-2026-97960)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 20198.0.0 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-138.oval.xml.tar.gz

Plugin Details

Severity: Medium

ID: 475535

Version: Revision 1.1

Type: Local

Published: 10/16/2026

Updated: 10/16/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.6

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.3

Temporal Score: 4.7

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

CVSS Score Source: CVE-2026-97960

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: 9/25/2026

Reference Information

CVE: CVE-2026-97960