CVE-2026-64075
In the Linux kernel, the following vulnerability has been resolved: fprobe: Fix unregister_fprobe() to wait for RCU grace period Commit 4346ba1604093 ("fprobe: Rewrite fprobe on function-graph tracer") changed fprobe to register struct fprobe to an rcu-hlist, but it forgot to wait for RCU GP. Thus there can be use-after-free if the fprobe is released right after unregistering. This can be happened on fprobe event and sample module code. To fix this issue, add synchronize_rcu() in unregister_fprobe(). Note that BPF is OK because fprobe is used as a part of bpf_kprobe_multi_link. This unregisters its fprobe in bpf_kprobe_multi_link_release() and it is deallocated via bpf_kprobe_multi_link_dealloc(), which is invoked from bpf_link_defer_dealloc_rcu_gp() RCU callback. For BPF, this also introduced unregister_fprobe_async() which does NOT wait for RCU grace priod.
- Score
- CVSS 3.1 7.8 High
- Status
- Analyzed - 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- Published
- 2026-07-19
- Last modified
- 2026-07-19
- Weaknesses
- CWE-416
Affected products
References
- https://git.kernel.org/stable/c/56b4cfcf1518245493c60fd39c56978f508f1816
- https://git.kernel.org/stable/c/657b594b2084b39a4bc6d8493aa2140cb00cea49
- https://git.kernel.org/stable/c/a4f6a9005ed6cfd360ef2520430927f05f92ffb0
