# CVE-2024-56675

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors

Uprobes always use bpf_prog_run_array_uprobe() under tasks-trace-RCU protection. But it is possible to attach a non-sleepable BPF program to a uprobe, and non-sleepable BPF programs are freed via normal RCU (see __bpf_prog_put_noref()). This leads to UAF of the bpf_prog because a normal RCU grace period does not imply a tasks-trace-RCU grace period.

Fix it by explicitly waiting for a tasks-trace-RCU grace period after removing the attachment of a bpf_prog to a perf_event.

Published Jul 25, 2026

[lore.kernel.org](https://lore.kernel.org/linux-cve-announce/2024122756-CVE-2024-56675-e996@gregkh/)

CVSS Score: 7.8 High

### CVE-2024-56675 Security Details

- **CVE ID:** CVE-2024-56675
- **CWE:** CWE-416 [Learn more about CWE-416](https://cwe.mitre.org/data/definitions/416.html)
- **CVE Description:** In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors

Fix it by explicitly waiting for a tasks-trace-RCU grace period after removing the attachment of a bpf_prog to a perf_event.

- **Published:** Jul 25, 2026
- **CVSS Score & Severity:** 7.8 High
- **CVSS Vector:** CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- **EPSS Score:** 0.024%
- **Malware:** malware
- **KEV Status:** Not in KEV Catalog: No known exploits
- **Affected Ecosystems:** affected
- **Source:** National Vulnerability Database

References:

[lore.kernel.org](https://lore.kernel.org/linux-cve-announce/2024122756-CVE-2024-56675-e996@gregkh/)