Google: sys-kernel/csql-kernel-6_1, sys-kernel/csql-kernel-6_6, sys-kernel/lakitu-kernel-6_1, sys-kernel/lakitu-kernel-6_6, sys-kernel/lakitu-nc-kernel-6_6, sys-kernel/lakitu-vgpu-kernel-6_6, sys-kernel/tpusev-kernel-6_6: security update to 18613.675.2

medium Tenable Cloud Security Plugin ID 466347

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: signal: clear JOBCTL_PENDING_MASK for
caller in zap_other_threads() When a multi-threaded process receives a stop signal (e.g., SIGSTOP),
do_signal_stop() sets JOBCTL_STOP_PENDING and JOBCTL_STOP_CONSUME on all threads and sets
signal->group_stop_count to the number of threads. If one of the threads concurrently calls execve(),
de_thread() invokes zap_other_threads() to kill all other threads. zap_other_threads() aborts the pending
group stop by resetting signal->group_stop_count to 0 and clears the JOBCTL_PENDING_MASK for all other
threads. However, it fails to clear the job control flags for the calling thread. When execve() completes,
the calling thread returns to user mode and checks for pending signals. Seeing the stale
JOBCTL_STOP_PENDING flag, it calls do_signal_stop(), which invokes task_participate_group_stop(). Since
JOBCTL_STOP_CONSUME is still set, it attempts to decrement the already-zero signal->group_stop_count,
triggering a warning: sig->group_stop_count == 0 WARNING: CPU: 1 PID: 6475 at kernel/signal.c:373
task_participate_group_stop+0x215/0x2d0 Call Trace: <TASK> do_signal_stop+0x3be/0x5c0 kernel/signal.c:2619
get_signal+0xa8c/0x1330 kernel/signal.c:2884 arch_do_signal_or_restart+0xbc/0x840
arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x8c/0x4d0 kernel/entry/common.c:98
do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK>
Fix this race condition by clearing the JOBCTL_PENDING_MASK for the calling thread in zap_other_threads(),
ensuring it does not retain any stale job control state after the thread group is destroyed. This aligns
with other functions that tear down a thread group and abort group stops, such as zap_process() and
complete_signal(), which correctly clear these flags for all threads including the current one.
(CVE-2026-53352)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18613.675.2 or later.

Plugin Details

Severity: Medium

ID: 466347

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/2/2026

Updated: 10/3/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.6

Vendor

Vendor Severity: MEDIUM

CVSS v2

Risk Factor: Low

Base Score: 3.8

Temporal Score: 2.8

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

CVSS Score Source: CVE-2026-53352

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

Vector: CVSS:3.0/AV:L/AC:H/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: 7/1/2026

Reference Information

CVE: CVE-2026-53352

Detections

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