{"id":70042,"date":"2025-09-12T21:31:56","date_gmt":"2025-09-12T18:01:56","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2025-39799-acpi-processor-perflib-move-problematic-pr-performance-check\/"},"modified":"2025-09-12T21:31:56","modified_gmt":"2025-09-12T18:01:56","slug":"cve-2025-39799-acpi-processor-perflib-move-problematic-pr-performance-check","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2025-39799-acpi-processor-perflib-move-problematic-pr-performance-check\/","title":{"rendered":"CVE-2025-39799 &#8211; ACPI: processor: perflib: Move problematic pr-&gt;performance check"},"content":{"rendered":"<p><strong>CVE ID : <\/strong>CVE-2025-39799<br \/>\n<br \/>\n<strong>Published : <\/strong> Sept. 12, 2025, 4:15 p.m. | 29\u00a0minutes ago<br \/>\n<br \/>\n<strong>Description : <\/strong>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ACPI: processor: perflib: Move problematic pr-&gt;performance check<\/p>\n<p>Commit d33bd88ac0eb (&#8220;ACPI: processor: perflib: Fix initial _PPC limit<br \/>\napplication&#8221;) added a pr-&gt;performance check that prevents the frequency<br \/>\nQoS request from being added when the given processor has no performance<br \/>\nobject.  Unfortunately, this causes a WARN() in freq_qos_remove_request()<br \/>\nto trigger on an attempt to take the given CPU offline later because the<br \/>\nfrequency QoS object has not been added for it due to the missing<br \/>\nperformance object.<\/p>\n<p>Address this by moving the pr-&gt;performance check before calling<br \/>\nacpi_processor_get_platform_limit() so it only prevents a limit from<br \/>\nbeing set for the CPU if the performance object is not present.  This<br \/>\nway, the frequency QoS request is added as it was before the above<br \/>\ncommit and it is present all the time along with the CPU&#8217;s cpufreq<br \/>\npolicy regardless of whether or not the CPU is online.<br \/>\n<br \/>\n<strong>Severity:<\/strong> 0.0 | NA<br \/>\n<br \/>\nVisit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID : CVE-2025-39799 Published : Sept. 12, 2025, 4:15 p.m. | 29\u00a0minutes ago Description : In the Linux kernel, the following vulnerability has been resolved: ACPI: processor: perflib: Move problematic pr-&gt;performance check Commit d33bd88ac0eb (&#8220;ACPI: processor: perflib: Fix initial _PPC limit application&#8221;) added a pr-&gt;performance check that prevents the frequency QoS request from being &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-70042","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/70042","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=70042"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/70042\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=70042"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=70042"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=70042"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}