CVE-2026-97961

About vulnerability

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_REFRESH, xxx) has been invoked and perf_event::event_limit hits zero.

Prevent the list corruption and convert for_each_list_entry() to for_each_list_entry_safe().

Affected product:

AlmaLinux 9.2 ESU , TuxCare 9.6 ESU , TuxCare 9.8 ESU

Affected packages:

kernel @ 5.14.0 (+2 more)

Live-patch status from KernelCare for each operating system.