Google: sys-kernel/csql-kernel-6_1, sys-kernel/lakitu-kernel-6_1: security update to 18244.448.6

medium Tenable Cloud Security Plugin ID 451022

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: arm64/fpsimd: Discard stale CPU state
when handling SME traps The logic for handling SME traps manipulates saved FPSIMD/SVE/SME state
incorrectly, and a race with preemption can result in a task having TIF_SME set and TIF_FOREIGN_FPSTATE
clear even though the live CPU state is stale (e.g. with SME traps enabled). This can result in warnings
from do_sme_acc() where SME traps are not expected while TIF_SME is set: | /* With TIF_SME userspace
shouldn't generate any traps */ | if (test_and_set_thread_flag(TIF_SME)) | WARN_ON(1); This is very
similar to the SVE issue we fixed in commit: 751ecf6afd6568ad ("arm64/sve: Discard stale CPU state when
handling SVE traps") The race can occur when the SME trap handler is preempted before and after
manipulating the saved FPSIMD/SVE/SME state, starting and ending on the same CPU, e.g. | void
do_sme_acc(unsigned long esr, struct pt_regs *regs) | { | // Trap on CPU 0 with TIF_SME clear, SME traps
enabled | // task->fpsimd_cpu is 0. | // per_cpu_ptr(&fpsimd_last_state, 0) is task. | | ... | | //
Preempted; migrated from CPU 0 to CPU 1. | // TIF_FOREIGN_FPSTATE is set. | | get_cpu_fpsimd_context(); |
| /* With TIF_SME userspace shouldn't generate any traps */ | if (test_and_set_thread_flag(TIF_SME)) |
WARN_ON(1); | | if (!test_thread_flag(TIF_FOREIGN_FPSTATE)) { | unsigned long vq_minus_one = |
sve_vq_from_vl(task_get_sme_vl(current)) - 1; | sme_set_vq(vq_minus_one); | | fpsimd_bind_task_to_cpu(); |
} | | put_cpu_fpsimd_context(); | | // Preempted; migrated from CPU 1 to CPU 0. | // task->fpsimd_cpu is
still 0 | // If per_cpu_ptr(&fpsimd_last_state, 0) is still task then: | // - Stale HW state is reused
(with SME traps enabled) | // - TIF_FOREIGN_FPSTATE is cleared | // - A return to userspace skips HW state
restore | } Fix the case where the state is not live and TIF_FOREIGN_FPSTATE is set by calling
fpsimd_flush_task_state() to detach from the saved CPU state. This ensures that a subsequent context
switch will not reuse the stale CPU state, and will instead set TIF_FOREIGN_FPSTATE, forcing the new state
to be reloaded from memory prior to a return to userspace. Note: this was originallly posted as [1]. [
Rutland: rewrite commit message ] (CVE-2025-38170)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18244.448.6 or later.

Plugin Details

Severity: Medium

ID: 451022

Version: Revision 1.2

Type: Local

Family: Google COS Security Checks

Published: 10/1/2026

Updated: 10/1/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.36

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-2025-38170

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: 7/3/2025

Reference Information

CVE: CVE-2025-38170

Detections

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