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Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12: security update to 19506.120.44

medium Tenable Self-Hosted Container Security Plugin ID 471960

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/sched: cls_fw: fix NULL pointer
 dereference on shared blocks The old-method path in fw_classify() calls tcf_block_q() and dereferences
 q->handle. Shared blocks leave block->q NULL, causing a NULL deref when an empty cls_fw filter is attached
 to a shared block and a packet with a nonzero major skb mark is classified. Reject the configuration in
 fw_change() when the old method (no TCA_OPTIONS) is used on a shared block, since fw_classify()'s old-
 method path needs block->q which is NULL for shared blocks. The fixed null-ptr-deref calling stack: KASAN:
 null-ptr-deref in range [0x0000000000000038-0x000000000000003f] RIP: 0010:fw_classify
 (net/sched/cls_fw.c:81) Call Trace: tcf_classify (./include/net/tc_wrapper.h:197 net/sched/cls_api.c:1764
 net/sched/cls_api.c:1860) tc_run (net/core/dev.c:4401) __dev_queue_xmit (net/core/dev.c:4535
 net/core/dev.c:4790) (CVE-2026-31421)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.120.44 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-129.oval.xml.tar.gz

Plugin Details

Severity: Medium

ID: 471960

Version: Revision 1.1

Type: Local

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

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-2026-31421

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: 4/13/2026

Reference Information

CVE: CVE-2026-31421