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 19216.395.4

high Tenable Cloud Security Plugin ID 468889

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: netfilter: nfnetlink_queue: do shared-
unconfirmed check before segmentation Ulrich reports a regression with nfqueue: If an application did not
set the 'F_GSO' capability flag and a gso packet with an unconfirmed nf_conn entry is received all packets
are now dropped instead of queued, because the check happens after skb_gso_segment(). In that case, we did
have exclusive ownership of the skb and its associated conntrack entry. The elevated use count is due to
skb_clone happening via skb_gso_segment(). Move the check so that its peformed vs. the aggregated packet.
Then, annotate the individual segments except the first one so we can do a 2nd check at reinject time. For
the normal case, where userspace does in-order reinjects, this avoids packet drops: first reinjected
segment continues traversal and confirms entry, remaining segments observe the confirmed entry. While at
it, simplify nf_ct_drop_unconfirmed(): We only care about unconfirmed entries with a refcnt > 1, there is
no need to special-case dying entries. This only happens with UDP. With TCP, the only unconfirmed packet
will be the TCP SYN, those aren't aggregated by GRO. Next patch adds a udpgro test case to cover this
scenario. (CVE-2026-45859)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.395.4 or later.

Plugin Details

Severity: High

ID: 468889

Version: Revision 1.4

Type: Local

Family: Google COS Security Checks

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: 23.71

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-45859

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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: 3/27/2026

Reference Information

CVE: CVE-2026-45859

Detections

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