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: security update to 18867.584.3

high Tenable Self-Hosted Container Security Plugin ID 466866

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: ipv6: fix Route Information option
length validation rt6_route_rcv() validates the Route Information option (RFC 4191) length against the
prefix length, but both checks are off by one. rinfo->length is the ND option length in units of 8 octets
and it *includes* the 8-byte option header, so an option carrying N bytes of prefix has length == 1 + N/8.
RFC 4191 section 2.3 requires length 3 when Prefix Length is greater than 64, and 2 or 3 when it is
greater than 0. The code accepts length >= 2 and length >= 1 respectively. ipv6_addr_prefix() then copies
prefix_len/8 bytes out of rinfo->prefix, so a Router Advertisement with (prefix_len=128, length=2) or
(prefix_len=64, length=1) makes the kernel read up to 8 bytes past the end of the option. Those bytes end
up in the prefix of the route that gets installed, so they are visible to userspace: # RA with a Route
Information option (prefix_len=128, length=2) # followed by a source link-layer address option, 01 01 de
ad be ef ca fe $ ip -6 route show 2001:db8:dead:beef:101:dead:beef:cafe via fe80::1234 dev veth0 proto ra
^^^^^^^^^^^^^^^^^^ the next option, read out of bounds When the Route Information option is the last one
in the packet, those eight bytes come from the skb tail room instead. Reject the option lengths RFC 4191
does not allow. (CVE-2026-74598)

Solution

Update the sys-kernel/csql-kernel-6_6 library and its related packages to version 18867.584.3 or later.

Plugin Details

Severity: High

ID: 466866

Version: Revision 1.5

Type: Local

Family: Google COS Security Checks

Published: 10/2/2026

Updated: 10/6/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.48

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:C/I:N/A:N

CVSS Score Source: CVE-2026-74598

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:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 8/22/2026

Reference Information

CVE: CVE-2026-74598

Detections

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