CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's kprobe subsystem, specifically the handling of the kprobe_blacklist, which can lead to dereferencing freed memory during concurrent operations. This flaw can result in system instability or crashes, particularly when modules are unloaded while kprobe operations are in progress. Linux kernel maintainers and system administrators should prioritize this issue to ensure the stability and security of their systems.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: kprobes: Protect kprobe_blacklist with RCU __within_kprobe_blacklist() traverses kprobe_blacklist without holding kprobe_mutex. When a module is unloaded, kprobe_remove_area_blacklist() removes blacklist entries and immediately frees them with kfree(). A concurrent call to within_kprobe_blacklist() can therefore dereference freed memory. Furthermore, within_kprobe_blacklist() can be called in atomic or non-preemptible contexts where the sleeping kprobe_mutex cannot be taken. Protect kprobe_blacklist with RCU. Use guard(rcu)() and list_for_each_entry_rcu() for traversal, list_add_tail_rcu() for insertions, list_del_rcu() for deletions, and kfree_rcu() to reclaim entries safely after a grace period.