CVE-2025-39859
- Source
- https://cve.org/CVERecord?id=CVE-2025-39859
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39859.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-39859
- Downstream
- Related
- Published
- 2025-09-19T15:26:29Z
- Modified
- 2026-08-12T03:51:34Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog
The ptp_ocp_detach() only shuts down the watchdog timer if it is pending. However, if the timer handler is already running, the timer_delete_sync() is not called. This leads to race conditions where the devlink that contains the ptp_ocp is deallocated while the timer handler is still accessing it, resulting in use-after-free bugs. The following details one of the race scenarios.
(thread 1) | (thread 2) ptp_ocp_remove() | ptp_ocp_detach() | ptp_ocp_watchdog() if (timer_pending(&bp->watchdog))| bp = timer_container_of() timer_delete_sync() | | devlink_free(devlink) //free | | bp-> //use
Resolve this by unconditionally calling timer_delete_sync() to ensure the timer is reliably deactivated, preventing any access after free.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39859.json" }- References
-
- https://git.kernel.org/stable/c/8bf935cf789872350b04c1a6468b0a509f67afb2
- https://git.kernel.org/stable/c/f10d3c7267ac7387a5129d5506c3c5f2460cfd9b
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39859.json
- https://nvd.nist.gov/vuln/detail/CVE-2025-39859
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git