{"cve":"CVE-2025-39859","nvd":{"published":"2025-09-19T16:15:44.867","modified":"2026-10-21T13:18:15.583","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog\n\nThe ptp_ocp_detach() only shuts down the watchdog timer if it is\npending. However, if the timer handler is already running, the\ntimer_delete_sync() is not called. This leads to race conditions\nwhere the devlink that contains the ptp_ocp is deallocated while\nthe timer handler is still accessing it, resulting in use-after-free\nbugs. The following details one of the race scenarios.\n\n(thread 1)                           | (thread 2)\nptp_ocp_remove()                     |\n  ptp_ocp_detach()                   | ptp_ocp_watchdog()\n    if (timer_pending(&bp->watchdog))|   bp = timer_container_of()\n      timer_delete_sync()            |\n                                     |\n  devlink_free(devlink) //free       |\n                                     |   bp-> //use\n\nResolve this by unconditionally calling timer_delete_sync() to ensure\nthe timer is reliably deactivated, preventing any access after free.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/8bf935cf789872350b04c1a6468b0a509f67afb2","https://git.kernel.org/stable/c/aad70bdfc8244616e48c434310cab241a3f17781","https://git.kernel.org/stable/c/e2a6eabe5304a789b7d40ce2576cd80154255e51","https://git.kernel.org/stable/c/f10d3c7267ac7387a5129d5506c3c5f2460cfd9b"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2025-39859","score":0.00195,"percentile":0.09073,"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."]}