Answer in brief
CVE-2025-39859 records a High severity (CVSS 7.8) vulnerability in ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=773bda96492153e11d21eb63ac814669b51fc701 <e2a6eabe5304a789b7d40ce2576cd80154255e51 || >=773bda96492153e11d21eb63ac814669b51fc701 <aad70bdfc8244616e48c434310cab241a3f17781 || >=773bda96492153e11d21eb63ac814669b51fc701 <f10d3c7267ac7387a5129d5506c3c5f2460cfd9b || >=773bda96492153e11d21eb63ac814669b51fc701 <8bf935cf789872350b04c1a6468b0a509f67afb2 | e2a6eabe5304a789b7d40ce2576cd80154255e51, aad70bdfc8244616e48c434310cab241a3f17781, f10d3c7267ac7387a5129d5506c3c5f2460cfd9b, 8bf935cf789872350b04c1a6468b0a509f67afb2 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Sep 19, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 21, 2026
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.
Quoted source text, attributed separately from HOL analysis.