Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12, sys-kernel/csql-kernel-6_6, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-kernel-6_6, sys-kernel/lakitu-nc-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_6, sys-kernel/lakitu-vgpu-kernel-6_6: security update to 19216.395.73

medium Tenable Self-Hosted Container Security Plugin ID 468551

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: btrfs: fix btrfs_ioctl_space_info()
slot_count TOCTOU which can lead to info-leak btrfs_ioctl_space_info() has a TOCTOU race between two
passes over the block group RAID type lists. The first pass counts entries to determine the allocation
size, then the second pass fills the buffer. The groups_sem rwlock is released between passes, allowing
concurrent block group removal to reduce the entry count. When the second pass fills fewer entries than
the first pass counted, copy_to_user() copies the full alloc_size bytes including trailing uninitialized
kmalloc bytes to userspace. Fix by copying only total_spaces entries (the actually-filled count from the
second pass) instead of alloc_size bytes, and switch to kzalloc so any future copy size mismatch cannot
leak heap data. (CVE-2026-46159)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.395.73 or later.

Plugin Details

Severity: Medium

ID: 468551

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/3/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Low

Base Score: 3.8

Temporal Score: 2.8

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

CVSS Score Source: CVE-2026-46159

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

Vector: CVSS:3.0/AV:L/AC:H/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: 5/28/2026

Reference Information

CVE: CVE-2026-46159

Detections

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