CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's handling of CRIU events, specifically in the kfd_criu_checkpoint_events() function, where the lack of proper mutex locking can lead to race conditions. This can result in memory corruption, as concurrent threads may modify event entries during the counting and allocation process, potentially leading to crashes or arbitrary code execution. Organizations using affected Linux distributions, particularly those leveraging F5 products, should prioritize addressing this issue to mitigate risks associated with system stability and security.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: hold event_mutex while checkpointing CRIU events kfd_criu_checkpoint_events() counts the entries in p->event_idr via kfd_get_num_events(), allocates an array sized to that count, and then walks the same IDR to fill it. Neither the count nor the walk holds p->event_mutex. The CRIU checkpoint caller holds only p->mutex. Event create and destroy (kfd_event_create()/kfd_event_destroy()) take p->event_mutex and do not take p->mutex, so a second thread in the same process can insert or remove events between the count and the walk. If an event is inserted, the walk iterates more entries than were counted and writes past the end of the ev_privs allocation; if an event is removed, the walk dereferences an entry that is being freed. Hold p->event_mutex across the count and the walk so both observe a consistent view of p->event_idr. The lock is released before copy_to_user(), which only touches the local buffer. The caller already holds p->mutex and the create/destroy paths never take p->mutex, so the p->mutex -> p->event_mutex order is not inverted and no deadlock is introduced. (cherry picked from commit ff57e223ab105795b05d3ef3f3c35a5a441bcbaa)