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CVE-2025-39799
ACPI: processor: perflib: Move problematic pr->performance check
Description

In the Linux kernel, the following vulnerability has been resolved: ACPI: processor: perflib: Move problematic pr->performance check Commit d33bd88ac0eb ("ACPI: processor: perflib: Fix initial _PPC limit application") added a pr->performance check that prevents the frequency QoS request from being added when the given processor has no performance object. Unfortunately, this causes a WARN() in freq_qos_remove_request() to trigger on an attempt to take the given CPU offline later because the frequency QoS object has not been added for it due to the missing performance object. Address this by moving the pr->performance check before calling acpi_processor_get_platform_limit() so it only prevents a limit from being set for the CPU if the performance object is not present. This way, the frequency QoS request is added as it was before the above commit and it is present all the time along with the CPU's cpufreq policy regardless of whether or not the CPU is online.

INFO

Published Date :

Sept. 12, 2025, 4:15 p.m.

Last Modified :

Sept. 12, 2025, 4:15 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-39799 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Update the Linux kernel to resolve issues with processor performance checks and frequency QoS requests.
  • Update the Linux kernel to the latest version.
  • Apply the patch that addresses the ACPI processor perflib vulnerability.
  • Ensure processor performance checks are moved before limit application.
  • Verify frequency QoS requests are handled correctly.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-39799.

URL Resource
https://git.kernel.org/stable/c/19849010c9e18d54375091864a3313fc328d6186
https://git.kernel.org/stable/c/31ee723d6fc581b76396994a96b85be3e87f67d6
https://git.kernel.org/stable/c/8972d7dbdac029c9dbf62a45d7d8c71999785765
https://git.kernel.org/stable/c/bf2809541497749c4f2646b87bf75244f5a2a5d9
https://git.kernel.org/stable/c/cb4b5f4a1e778f6a20d06d4eda6842714a817618
https://git.kernel.org/stable/c/d405ec23df13e6df599f5bd965a55d13420366b8
https://git.kernel.org/stable/c/edc065c19257adfd9c356178dac021df661e169e
https://git.kernel.org/stable/c/fc36403e741d7674a44632313db33fa7605cb2b4
https://git.kernel.org/stable/c/fd9cad6b0676e0bb3a98ee0a8865a86e2f53eb07
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-39799 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-39799 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-39799 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-39799 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Sep. 12, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: ACPI: processor: perflib: Move problematic pr->performance check Commit d33bd88ac0eb ("ACPI: processor: perflib: Fix initial _PPC limit application") added a pr->performance check that prevents the frequency QoS request from being added when the given processor has no performance object. Unfortunately, this causes a WARN() in freq_qos_remove_request() to trigger on an attempt to take the given CPU offline later because the frequency QoS object has not been added for it due to the missing performance object. Address this by moving the pr->performance check before calling acpi_processor_get_platform_limit() so it only prevents a limit from being set for the CPU if the performance object is not present. This way, the frequency QoS request is added as it was before the above commit and it is present all the time along with the CPU's cpufreq policy regardless of whether or not the CPU is online.
    Added Reference https://git.kernel.org/stable/c/19849010c9e18d54375091864a3313fc328d6186
    Added Reference https://git.kernel.org/stable/c/31ee723d6fc581b76396994a96b85be3e87f67d6
    Added Reference https://git.kernel.org/stable/c/8972d7dbdac029c9dbf62a45d7d8c71999785765
    Added Reference https://git.kernel.org/stable/c/bf2809541497749c4f2646b87bf75244f5a2a5d9
    Added Reference https://git.kernel.org/stable/c/cb4b5f4a1e778f6a20d06d4eda6842714a817618
    Added Reference https://git.kernel.org/stable/c/d405ec23df13e6df599f5bd965a55d13420366b8
    Added Reference https://git.kernel.org/stable/c/edc065c19257adfd9c356178dac021df661e169e
    Added Reference https://git.kernel.org/stable/c/fc36403e741d7674a44632313db33fa7605cb2b4
    Added Reference https://git.kernel.org/stable/c/fd9cad6b0676e0bb3a98ee0a8865a86e2f53eb07
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.