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 19216.739.5

high Tenable Cloud Security Plugin ID 474917

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: af_unix: Unlink scc_entry in
unix_del_edge(). Kyle Zeng reported that GC could free a dead SCC partially. The scenario is as follows:
1) Create two SCCs: X -. A <-> B ^--' 2) Run the following concurrently: 2-1) send() sk-B to sk-B from
sk-X 2-2) close() both A and B At 2-1), there is a small window where unix_add_edges() publishes a new
edge (B <-> B) to GC but its skb is not queued by skb_queue_tail(). If 2-2) completes before
skb_queue_tail() and GC is triggered, it judges A <-> B as dead, but B is not freed because GC cannot
collect the not-yet-queued skb holding the B <-> B edge. X -. A <-> B -. This edge is visible ^--' ^..'
but skb is not This itself is not a problem since the next GC run will judge B as dead as well and free it
finally. X -. A <.> B -. ^--' ^--' However, X's SCC forces the next GC to call unix_walk_scc_fast(), and
it iterates over A through B's scc_entry. Let's unlink scc_entry before freeing the vertex in
unix_del_edge(). (CVE-2026-80521)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.739.5 or later.

Plugin Details

Severity: High

ID: 474917

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/16/2026

Updated: 10/16/2026

Risk Information

VPR

Risk Factor: High

Score: 7.9

Percentile: 99.32

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-80521

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

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

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 8/26/2026

Reference Information

CVE: CVE-2026-80521

Detections

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