CVE-2025-40021: Linux

EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: tracing: dynevent: Add a missing lockdown check on dynevent Since dynamic_events interface on tracefs is compatible with kprobe_events and uprobe_events, it should also check the lockdown status and reject if it is set.

Affected products

• Linux Linux: from 5.4, before 5.10.245 (fixed in 5.10.245); from 5.11, before 5.15.194 (fixed in 5.15.194); from 5.16, before 6.1.155 (fixed in 6.1.155); from 6.2, before 6.6.109 (fixed in 6.6.109); from 6.7, before 6.12.50 (fixed in 6.12.50); from 6.13, before 6.16.10 (fixed in 6.16.10)

Published 2025-10-24. Last modified 2026-06-17.