CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel affects the handling of performance events, specifically allowing exited events to remain as group leaders, which can lead to the retention of invalid pointers to freed memory. This flaw poses a risk of memory corruption and potential denial of service if exploited. System administrators and developers managing Linux environments should prioritize addressing this issue to maintain system integrity and performance stability.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: perf: Reject exited events as group leaders perf_event_remove_on_exec() sets remove-on-exec events to the EXIT state and detaches their group relationships. The event's file descriptor can remain open, however, and perf_event_open() currently accepts that event as a group leader because its early validation rejects only REVOKED and DEAD events. A new sibling can consequently be linked to the detached leader. When the leader is closed, perf_group_detach() observes that its PERF_ATTACH_GROUP bit is already clear and skips the new sibling. The sibling then retains a group_leader pointer to the freed event. Reject group leaders in the EXIT state. Perform the check while holding the shared context mutex so that an exec in the target task cannot detach the leader between validation and group attachment. [peterz: make the earlier test fully consistent]