Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4346ba1604093305a287e08eb465a9c15ba05b80 before 56b4cfcf1518245493c60fd39c56978f508f1816; affected 4346ba1604093305a287e08eb465a9c15ba05b80 before a4f6a9005ed6cfd360ef2520430927f05f92ffb0; affected 4346ba1604093305a287e08eb465a9c15ba05b80 before 657b594b2084b39a4bc6d8493aa2140cb00cea49 |
| Linux / Linux | affected 6.14; unaffected 0 before 6.14; unaffected 6.18.34 through 6.18.*; unaffected 7.0.11 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.