CVE-2026-23309

In the Linux kernel, the following vulnerability has been resolved: tracing: Add NULL pointer check to trigger_data_free() If trigger_data_alloc() fails and returns NULL, event_hist_trigger_parse() jumps to the out_free error path. While kfree() safely handles a NULL pointer, trigger_data_free() does not. This causes a NULL pointer dereference in trigger_data_free() when evaluating data->cmd_ops->set_filter. Fix the problem by adding a NULL pointer check to trigger_data_free(). The problem was found by an experimental code review agent based on gemini-3.1-pro while reviewing backports into v6.18.y.

• linux linux kernel (>= 6.1.165 < 6.1.167) • linux linux kernel (>= 6.6.128 < 6.6.130) • linux linux kernel (>= 6.12.75 < 6.12.77) • linux linux kernel (>= 6.18.14 < 6.18.17) • linux linux kernel (>= 6.19.4 < 6.19.7) • linux linux kernel 7.0