CVE-2026-23159 perf: sched: Fix perf crash with new is_user_task() helper

In the Linux kernel, the following vulnerability has been resolved: perf: sched: Fix perf crash with new isusertask helper In order to do a user space stacktrace the current task needs to be a user task that has executed in user space. It use to be possible to test if a task is a user task or not...

PT-2026-8154

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description The Linux kernel contains a flaw in the perf subsystem related to user space stack tracing. A race condition can occur when a task is exiting, leading to a NULL pointer dereference if pe...