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Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_6: security update to 19216.220.185

high Tenable Cloud Security Plugin ID 472190

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: flowlabel: defer exclusive
 option free until RCU teardown `ip6fl_seq_show()` walks the global flowlabel hash under the seq-file RCU
 read-side lock and prints `fl->opt->opt_nflen` when an option block is present. Exclusive flowlabels
 currently free `fl->opt` as soon as `fl->users` drops to zero in `fl_release()`. However, the surrounding
 `struct ip6_flowlabel` remains visible in the global hash table until later garbage collection removes it
 and `fl_free_rcu()` finally tears it down. A concurrent `/proc/net/ip6_flowlabel` reader can therefore
 race that early `kfree()` and dereference freed option state, triggering a crash in `ip6fl_seq_show()`.
 Fix this by keeping `fl->opt` alive until `fl_free_rcu()`. That matches the lifetime already required for
 the enclosing flowlabel while readers can still reach it under RCU. (CVE-2026-31680)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.220.185 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-125.oval.xml.tar.gz

Plugin Details

Severity: High

ID: 472190

Version: Revision 1.1

Type: Local

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.04

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-31680

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 4/23/2026

Reference Information

CVE: CVE-2026-31680