CVE-2026-64075 Details
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.
A use-after-free vulnerability has been identified in the Linux kernel's fprobe functionality. This issue arises because the fprobe is registered to an RCU-hlist, but the unregistration process does not wait for the RCU grace period. As a result, if a fprobe is unregistered and then immediately released, it can lead to a use-after-free scenario. This vulnerability can occur in fprobe events and sample module code. The issue has been addressed by modifying the unregistration function to include a synchronization step that waits for the RCU grace period. It's important to note that this vulnerability does not affect BPF, as fprobe is managed differently in that context.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/56b4cfcf1518245493c60fd39c56978f508f1816 | kernel.org | Patch |
| https://git.kernel.org/stable/c/657b594b2084b39a4bc6d8493aa2140cb00cea49 | kernel.org | Patch |
| https://git.kernel.org/stable/c/a4f6a9005ed6cfd360ef2520430927f05f92ffb0 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.14, < 6.18.34 >= 6.19, < 7.0.11 7.1 rc1 7.1 rc2 7.1 rc3 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 3, 2026 | Initial Analysis | [email protected] |
| Jul 19, 2026 | New CVE Received | kernel.org |