CVE-2024-56675: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 6.0, before 6.1.121 (fixed in 6.1.121); from 6.2, before 6.6.67 (fixed in 6.6.67); from 6.7, before 6.12.6 (fixed in 6.12.6); version 6.13 only

Published 2024-12-27. Last modified 2026-06-17.