Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12: security update to 19506.0.140

high Tenable Cloud Security Plugin ID 471873

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: xfs: delete attr leaf freemap entries
when empty Back in commit 2a2b5932db6758 ("xfs: fix attr leaf header freemap.size underflow"), Brian
Foster observed that it's possible for a small freemap at the end of the end of the xattr entries array to
experience a size underflow when subtracting the space consumed by an expansion of the entries array.
There are only three freemap entries, which means that it is not a complete index of all free space in the
leaf block. This code can leave behind a zero-length freemap entry with a nonzero base. Subsequent
setxattr operations can increase the base up to the point that it overlaps with another freemap entry.
This isn't in and of itself a problem because the code in _leaf_add that finds free space ignores any
freemap entry with zero size. However, there's another bug in the freemap update code in _leaf_add, which
is that it fails to update a freemap entry that begins midway through the xattr entry that was just
appended to the array. That can result in the freemap containing two entries with the same base but
different sizes (0 for the "pushed-up" entry, nonzero for the entry that's actually tracking free space).
A subsequent _leaf_add can then allocate xattr namevalue entries on top of the entries array, leading to
data loss. But fixing that is for later. For now, eliminate the possibility of confusion by zeroing out
the base of any freemap entry that has zero size. Because the freemap is not intended to be a complete
index of free space, a subsequent failure to find any free space for a new xattr will trigger block
compaction, which regenerates the freemap. It looks like this bug has been in the codebase for quite a
long time. (CVE-2026-43187)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.0.140 or later.

Plugin Details

Severity: High

ID: 471873

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/6/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.96

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-43187

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/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: 3/12/2026

Reference Information

CVE: CVE-2026-43187

Detections

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