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 470484

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: binfmt_misc: use
exe_file_deny_write_access() for the interpreter clone For MISC_FMT_OPEN_FILE entries load_misc_binary()
clones the registered interpreter file and denies write access to the clone via plain deny_write_access().
The clone is installed as bprm->interpreter and later released by the exec machinery through
exe_file_allow_write_access() which skips the i_writecount increment for files with FMODE_FSNOTIFY_HSM
set. The deny and allow side can therefore come to different conclusions when pre-content watches are in
play: if a pre-content watch is added to the interpreter after registration every subsequent exec through
that entry takes a write denial on the clone that is never paired with a write allowance, driving the
interpreter inode's i_writecount further down with each exec and leaving the interpreter unwritable even
after the entry and all its users are gone. Take the write denial via exe_file_deny_write_access() so both
sides of the pairing base their decision on the same file mode, and propagate failure instead of silently
ignoring it: an interpreter that is concurrently open for writing now fails the exec with ETXTBSY, exactly
like an interpreter freshly opened via open_exec() would. (CVE-2026-74486)

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: 470484

Version: Revision 1.4

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: 53.55

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Low

Base Score: 3.3

Temporal Score: 2.4

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

CVSS Score Source: CVE-2026-74486

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:N/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: 8/15/2026

Reference Information

CVE: CVE-2026-74486

Detections

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