{"cve":"CVE-2025-38539","nvd":{"published":"2025-08-16T12:15:29.717","modified":"2026-10-15T22:18:45.043","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Add down_write(trace_event_sem) when adding trace event\n\nWhen a module is loaded, it adds trace events defined by the module. It\nmay also need to modify the modules trace printk formats to replace enum\nnames with their values.\n\nIf two modules are loaded at the same time, the adding of the event to the\nftrace_events list can corrupt the walking of the list in the code that is\nmodifying the printk format strings and crash the kernel.\n\nThe addition of the event should take the trace_event_sem for write while\nit adds the new event.\n\nAlso add a lockdep_assert_held() on that semaphore in\n__trace_add_event_dirs() as it iterates the list.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/33e20747b47ddc03569b6bc27a2d6894c1428182","https://git.kernel.org/stable/c/6bc94f20a4c304997288f9a45278c9d0c06987d3","https://git.kernel.org/stable/c/70fecd519caad0c1741c3379d5348c9000a5b29d","https://git.kernel.org/stable/c/7803b28c9aa8d8bd4e19ebcf5f0db9612b0f333b","https://git.kernel.org/stable/c/b5e8acc14dcb314a9b61ff19dcd9fdd0d88f70df"],"products":["debian:debian_linux","linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:06:45.861874017+00:00"},"epss":{"cve":"CVE-2025-38539","score":0.00179,"percentile":0.07393,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}