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.
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.
Metrics
Affected Vendors & Products
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Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Fri, 12 Sep 2025 16:15:00 +0000
| Type | Values Removed | Values 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. | |
| Title | ACPI: processor: perflib: Move problematic pr->performance check | |
| References |
|
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2025-09-12T15:59:35.221Z
Reserved: 2025-04-16T07:20:57.133Z
Link: CVE-2025-39799
Vulnrichment
No data.
NVD
Status : Received
Published: 2025-09-12T16:15:34.410
Modified: 2025-09-12T16:15:34.410
Link: CVE-2025-39799
Redhat
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OpenCVE Enrichment
No data.