Google: sys-kernel/cchost-kernel-6_18, sys-kernel/csql-kernel-6_18, sys-kernel/lakitu-kernel-6_18, sys-kernel/lakitu-nc-kernel-6_18: security update to 19999.44.21

high Tenable Cloud Security Plugin ID 471120

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: bpf: Reject exclusive maps as inner
maps in map-in-map An exclusive map (created with excl_prog_hash) is bound to a single program by hash:
check_map_prog_compatibility() refuses to load any program whose digest does not match map->excl_prog_sha.
That check only runs for maps a program references directly, i.e. its used_maps. A map reached at runtime
through a map-of-maps is never in used_maps, and bpf_map_meta_equal() does not consider excl_prog_sha, so
an exclusive map can be inserted into a non-exclusive outer map and then looked up and mutated by an
unrelated program, bypassing the exclusivity guarantee. For the signed loader this defeats the metadata
map exclusivity check added in the signed loader: the cached map->sha[] is validated against the signed
hash while another program on a hostile host rewrites the frozen map's contents through the outer map.
(CVE-2026-74364)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 19999.44.21 or later.

Plugin Details

Severity: High

ID: 471120

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: Medium

Score: 4.3

Percentile: 53.51

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 4.6

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

CVSS Score Source: CVE-2026-74364

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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: 8/15/2026

Reference Information

CVE: CVE-2026-74364

Detections

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