Riskcovery

CVE-2026-64075

fprobe: Fix unregister_fprobe() to wait for RCU grace period

State
Published
Severity
Not scored
Published
Jul 19, 2026
Updated
Jul 19, 2026
Reserved
Jul 19, 2026

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 4346ba1604093305a287e08eb465a9c15ba05b80 to before 56b4cfcf1518245493c60fd39c56978f508f1816Affected
  • 4346ba1604093305a287e08eb465a9c15ba05b80 to before a4f6a9005ed6cfd360ef2520430927f05f92ffb0Affected
  • 4346ba1604093305a287e08eb465a9c15ba05b80 to before 657b594b2084b39a4bc6d8493aa2140cb00cea49Affected
LinuxLinux
  • 6.14Affected
  • before 6.14Not affected
  • 6.18.34 through 6.18.*Not affected
  • 7.0.11 through 7.0.*Not affected
  • 7.1 and laterNot affected

References

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