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Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12: security update to 19506.0.66

medium Tenable Cloud Security Plugin ID 472191

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: smb: client: split cached_fid
 bitfields to avoid shared-byte RMW races is_open, has_lease and on_list are stored in the same bitfield
 byte in struct cached_fid but are updated in different code paths that may run concurrently. Bitfield
 assignments generate byte read–modify–write operations (e.g. `orb $mask, addr` on x86_64), so updating one
 flag can restore stale values of the others. A possible interleaving is: CPU1: load old byte (has_lease=1,
 on_list=1) CPU2: clear both flags (store 0) CPU1: RMW store (old | IS_OPEN) -> reintroduces cleared bits
 To avoid this class of races, convert these flags to separate bool fields. (CVE-2026-23230)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.0.66 or later.

See Also

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

Plugin Details

Severity: Medium

ID: 472191

Version: Revision 1.2

Type: Local

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.3

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-2026-23230

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: 2/18/2026

Reference Information

CVE: CVE-2026-23230