💣Exploit CVE-2024-56675 - Linux Kernel BPF UAF Vulnerability

[Maksim]

CVE ID : CVE-2024-56675
Published : Dec. 27, 2024, 3:15 p.m. | 17 minutes ago
Description : 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.
Severity: 0.0 | NA
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