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Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12: security update to 19216.220.99

medium Tenable Self-Hosted Container Security Plugin ID 467534

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: tracing: Fix WARN_ON in
 tracing_buffers_mmap_close When a process forks, the child process copies the parent's VMAs but the
 user_mapped reference count is not incremented. As a result, when both the parent and child processes
 exit, tracing_buffers_mmap_close() is called twice. On the second call, user_mapped is already 0, causing
 the function to return -ENODEV and triggering a WARN_ON. Normally, this isn't an issue as the memory is
 mapped with VM_DONTCOPY set. But this is only a hint, and the application can call madvise(MADVISE_DOFORK)
 which resets the VM_DONTCOPY flag. When the application does that, it can trigger this issue on fork. Fix
 it by incrementing the user_mapped reference count without re-mapping the pages in the VMA's open
 callback. (CVE-2026-23380)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.220.99 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-125.oval.xml.tar.gz

Plugin Details

Severity: Medium

ID: 467534

Version: Revision 1.2

Type: Local

Published: 10/3/2026

Updated: 10/5/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.62

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-2026-23380

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: 3/25/2026

Reference Information

CVE: CVE-2026-23380