CVE-2025-40130

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

scsi: ufs: core: Fix data race in CPU latency PM QoS request handling

The cpu_latency_qos_add/remove/update_request interfaces lack internal

synchronization by design, requiring the caller to ensure thread safety.

The current implementation relies on the 'pm_qos_enabled' flag, which is

insufficient to prevent concurrent access and cannot serve as a proper

synchronization mechanism. This has led to data races and list

corruption issues.

A typical race condition call trace is:

[Thread A]

ufshcd_pm_qos_exit()

--> cpu_latency_qos_remove_request()

--> cpu_latency_qos_apply();

--> pm_qos_update_target()

--> plist_del <--(1) delete plist node

--> memset(req, 0, sizeof(*req));

--> hba->pm_qos_enabled = false;

[Thread B]

ufshcd_devfreq_target

--> ufshcd_devfreq_scale

--> ufshcd_scale_clks

--> ufshcd_pm_qos_update <--(2) pm_qos_enabled is true

--> cpu_latency_qo

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References