vulnerability

Amazon Linux 2023: CVE-2025-40194: Important priority package update for kernel (Multiple Advisories)

Severity
6
CVSS
(AV:L/AC:M/Au:S/C:P/I:P/A:C)
Published
Nov 12, 2025
Added
Dec 9, 2025
Modified
Dec 9, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:
cpufreq: intel_pstate: Fix object lifecycle issue in update_qos_request()
The cpufreq_cpu_put() call in update_qos_request() takes place too early
because the latter subsequently calls freq_qos_update_request() that
indirectly accesses the policy object in question through the QoS request
object passed to it.
Fortunately, update_qos_request() is called under intel_pstate_driver_lock,
so this issue does not matter for changing the intel_pstate operation
mode, but it theoretically can cause a crash to occur on CPU device hot
removal (which currently can only happen in virt, but it is formally
supported nevertheless).
Address this issue by modifying update_qos_request() to drop the
reference to the policy later.

Solutions

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