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 469606

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: dm: clear cloned request bio pointer
when last clone bio completes Stale rq->bio values have been observed to cause double-initialization of
cloned bios in request-based device-mapper targets, leading to use-after-free and double-free scenarios.
One such case occurs when using dm-multipath on top of a PCIe NVMe namespace, where cloned request bios
are freed during blk_complete_request(), but rq->bio is left intact. Subsequent clone teardown then
attempts to free the same bios again via blk_rq_unprep_clone(). The resulting double-free path looks like:
nvme_pci_complete_batch() nvme_complete_batch() blk_mq_end_request_batch() blk_complete_request() //
called on a DM clone request bio_endio() // first free of all clone bios ... rq->end_io() //
end_clone_request() dm_complete_request(tio->orig) dm_softirq_done() dm_done() dm_end_request()
blk_rq_unprep_clone() // second free of clone bios Fix this by clearing the clone request's bio pointer
when the last cloned bio completes, ensuring that later teardown paths do not attempt to free already-
released bios. (CVE-2026-43278)

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: 469606

Version: Revision 1.4

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: 6.9

Percentile: 96.84

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-43278

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/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-2026-43278

Detections

Analytics