CVE-2026-97961

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

perf/core: Allow list_del during perf_event_overflow()

A PMU might use perf_sched_cb_inc() and perf_sched_cb_dec()

interface to get the PMU call back function pmu::sched_task

invoked at schedule in and schedule out. This is achieved

by walking along the list anchored by sched_cb_list.

The following scenario might lead to a list corruption.

perf_pmu_sched_task()

for_each_list_entry(..., &sched_cb_list)

+--> __perf_pmu_sched_task()

+--> event->pmu->sched_task())

+--> PMU_push_sample()

+--> perf_event_overflow()

+--> __perf_event_overflow()

+--> pmu->stop()

+--> perf_sched_cb_dec()

remove entry from sched_cb_list

while list node in use.

This happens when ioctl(fd, PERF_EVENT_IOC_REFR

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References