CVE-2026-64075

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> fprobe: Fix unregister_fprobe() to wait for RCU grace period<br /> <br /> Commit 4346ba1604093 ("fprobe: Rewrite fprobe on function-graph tracer")<br /> changed fprobe to register struct fprobe to an rcu-hlist, but it forgot<br /> to wait for RCU GP. Thus there can be use-after-free if the fprobe is<br /> released right after unregistering. This can be happened on fprobe<br /> event and sample module code.<br /> <br /> To fix this issue, add synchronize_rcu() in unregister_fprobe().<br /> <br /> Note that BPF is OK because fprobe is used as a part of<br /> bpf_kprobe_multi_link. This unregisters its fprobe in<br /> bpf_kprobe_multi_link_release() and it is deallocated via<br /> bpf_kprobe_multi_link_dealloc(), which is invoked from<br /> bpf_link_defer_dealloc_rcu_gp() RCU callback.<br /> <br /> For BPF, this also introduced unregister_fprobe_async() which does<br /> NOT wait for RCU grace priod.