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Google: sys-kernel/csql-kernel-6_1, sys-kernel/csql-kernel-6_6: security update to 18613.534.53

medium Tenable Cloud Security Plugin ID 466567

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: net: ipv6: fix panic when IPv4 route
 references loopback IPv6 nexthop When a standalone IPv6 nexthop object is created with a loopback device
 (e.g., "ip -6 nexthop add id 100 dev lo"), fib6_nh_init() misclassifies it as a reject route. This is
 because nexthop objects have no destination prefix (fc_dst=::), causing fib6_is_reject() to match any
 loopback nexthop. The reject path skips fib_nh_common_init(), leaving nhc_pcpu_rth_output unallocated. If
 an IPv4 route later references this nexthop, __mkroute_output() dereferences NULL nhc_pcpu_rth_output and
 panics. Simplify the check in fib6_nh_init() to only match explicit reject routes (RTF_REJECT) instead of
 using fib6_is_reject(). The loopback promotion heuristic in fib6_is_reject() is handled separately by
 ip6_route_info_create_nh(). After this change, the three cases behave as follows: 1. Explicit reject route
 ("ip -6 route add unreachable 2001:db8::/64"): RTF_REJECT is set, enters reject path, skips
 fib_nh_common_init(). No behavior change. 2. Implicit loopback reject route ("ip -6 route add
 2001:db8::/32 dev lo"): RTF_REJECT is not set, takes normal path, fib_nh_common_init() is called.
 ip6_route_info_create_nh() still promotes it to reject afterward. nhc_pcpu_rth_output is allocated but
 unused, which is harmless. 3. Standalone nexthop object ("ip -6 nexthop add id 100 dev lo"): RTF_REJECT is
 not set, takes normal path, fib_nh_common_init() is called. nhc_pcpu_rth_output is properly allocated,
 fixing the crash when IPv4 routes reference this nexthop. (CVE-2026-23300)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18613.534.53 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-117.oval.xml.tar.gz

Plugin Details

Severity: Medium

ID: 466567

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2026-23300

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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: 3/25/2026

Reference Information

CVE: CVE-2026-23300