Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_12: security update to 19506.448.8

high Tenable Self-Hosted Container Security Plugin ID 470076

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: vhost: fix vhost_get_avail_idx for a
non empty ring vhost_get_avail_idx is supposed to report whether it has updated vq->avail_idx. Instead, it
returns whether all entries have been consumed, which is usually the same. But not always - in
drivers/vhost/net.c and when mergeable buffers have been enabled, the driver checks whether the combined
entries are big enough to store an incoming packet. If not, the driver re-enables notifications with
available entries still in the ring. The incorrect return value from vhost_get_avail_idx propagates
through vhost_enable_notify and causes the host to livelock if the guest is not making progress, as vhost
will immediately disable notifications and retry using the available entries. This goes back to commit
d3bb267bbdcb ("vhost: cache avail index in vhost_enable_notify()") which changed vhost_enable_notify() to
compare the freshly read avail index against vq->last_avail_idx instead of the previously cached
vq->avail_idx. Commit 7ad472397667 ("vhost: move smp_rmb() into vhost_get_avail_idx()") then carried over
the same comparison when refactoring vhost_enable_notify() to call the unified vhost_get_avail_idx(). The
obvious fix is to make vhost_get_avail_idx do what the comment says it does and report whether new entries
have been added. (CVE-2026-74356)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.448.8 or later.

Plugin Details

Severity: High

ID: 470076

Version: Revision 1.6

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: Low

Score: 3.3

Percentile: 50.91

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

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

CVSS Score Source: CVE-2026-74356

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/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: 8/11/2026

Reference Information

CVE: CVE-2026-74356

Detections

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