{"id":"CVE-2025-40130","title":"scsi: ufs: core: Fix data race in CPU latency PM QoS request handling","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ufs: core: Fix data race in CPU latency PM QoS request handling\n\nThe cpu_latency_qos_add/remove/update_request interfaces lack internal\nsynchronization by design,…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 2777e73fc154e2e87233bdcc0e2402b33815198e < eee1b13526b8f1e6a2402973d95f9fa854771f57","Linux >= 2777e73fc154e2e87233bdcc0e2402b33815198e < d9df61afb8d23c475f1be3c714da2c34c156ab01","Linux >= 2777e73fc154e2e87233bdcc0e2402b33815198e < 79dde5f7dc7c038eec903745dc1550cd4139980e","Linux 6.9"],"published":"2025-11-12","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:37:48.510Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-40130","references":[{"url":"https://git.kernel.org/stable/c/eee1b13526b8f1e6a2402973d95f9fa854771f57"},{"url":"https://git.kernel.org/stable/c/d9df61afb8d23c475f1be3c714da2c34c156ab01"},{"url":"https://git.kernel.org/stable/c/79dde5f7dc7c038eec903745dc1550cd4139980e"}],"tags":["cve.org"],"epss":0.00238,"epssPercentile":0.14765,"ingestedAt":"2026-10-21T12:48:53.682Z","slug":"CVE-2025-40130","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ufs: core: Fix data race in CPU latency PM QoS request handling\n\nThe cpu_latency_qos_add/remove/update_request interfaces lack internal\nsynchronization by design, requiring the caller to ensure thread safety.\nThe current implementation relies on the 'pm_qos_enabled' flag, which is\ninsufficient to prevent concurrent access and cannot serve as a proper\nsynchronization mechanism. This has led to data races and list\ncorruption issues.\n\nA typical race condition call trace is:\n\n[Thread A]\nufshcd_pm_qos_exit()\n  --> cpu_latency_qos_remove_request()\n    --> cpu_latency_qos_apply();\n      --> pm_qos_update_target()\n        --> plist_del              <--(1) delete plist node\n    --> memset(req, 0, sizeof(*req));\n  --> hba->pm_qos_enabled = false;\n\n[Thread B]\nufshcd_devfreq_target\n  --> ufshcd_devfreq_scale\n    --> ufshcd_scale_clks\n      --> ufshcd_pm_qos_update     <--(2) pm_qos_enabled is true\n        --> cpu_latency_qos_update_request\n          --> pm_qos_update_target\n            --> plist_del          <--(3) plist node use-after-free\n\nIntroduces a dedicated mutex to serialize PM QoS operations, preventing\ndata races and ensuring safe access to PM QoS resources, including sysfs\ninterface reads.\n\n## Affected\n\n- `Linux >= 2777e73fc154e2e87233bdcc0e2402b33815198e < eee1b13526b8f1e6a2402973d95f9fa854771f57`\n- `Linux >= 2777e73fc154e2e87233bdcc0e2402b33815198e < d9df61afb8d23c475f1be3c714da2c34c156ab01`\n- `Linux >= 2777e73fc154e2e87233bdcc0e2402b33815198e < 79dde5f7dc7c038eec903745dc1550cd4139980e`\n- `Linux 6.9`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}