Google: sys-kernel/csql-kernel-6_6, sys-kernel/lakitu-kernel-6_6, sys-kernel/lakitu-nc-kernel-6_6, sys-kernel/lakitu-vgpu-kernel-6_6, sys-kernel/tpusev-kernel-6_6: security update to 18613.731.2

high Tenable Cloud Security Plugin ID 466020

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: nf_conncount: prevent
connlimit drops for early confirmed ct Commit 69894e5b4c5e ("netfilter: nft_connlimit: update the count if
add was skipped") introduced a regression where packets for valid connections are dropped when using
connlimit for soft-limiting scenarios. The issue occurs when a new connection reuses a socket currently in
the TIME_WAIT state. In this scenario, the connection tracking entry is evaluated as already confirmed.
Previously, __nf_conncount_add() assumed that if a connection was confirmed and did not originate from the
loopback interface, it should skip the addition and return -EEXIST. Skipping the addition triggers a
garbage collection run that cleans up the TIME_WAIT connection. Consequently, the active connection count
drops to 0, which xt_connlimit mishandles, leading to the false rejection of the perfectly valid new
connection. Fix this by replacing the interface check with protocol-agnostic state checks. We now skip the
tree insertion and preserve the lockless garbage collection optimization only if the connection is
IPS_ASSURED. This allows early-confirmed setup packets (such as reused TIME_WAIT sockets or locally
generated SYN-ACKs) to be properly evaluated and counted without falsely dropping. The goto
check_connections path is maintained to ensure these setup packets are deduplicated correctly. This has
been tested with slowhttptest and HTTP server configured locally to ensure we are not breaking soft-
limiting scenarios for local or external connections. In addition, it was tested with a OVS zone limit
too. (CVE-2026-72418)

Solution

Update the sys-kernel/csql-kernel-6_6 library and its related packages to version 18613.731.2 or later.

Plugin Details

Severity: High

ID: 466020

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/2/2026

Updated: 10/3/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.66

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-2026-72418

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: 8/11/2026

Reference Information

CVE: CVE-2026-72418

Detections

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