Use After Free Affecting kernel-libbpf-static package, versions <0:6.1.124-134.200.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (11th percentile)

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  • Snyk IDSNYK-AMZN2023-KERNELLIBBPFSTATIC-9523668
  • published27 Mar 2025
  • disclosed27 Dec 2024

Introduced: 27 Dec 2024

CVE-2024-56665  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel-libbpf-static to version 0:6.1.124-134.200.amzn2023 or higher.
This issue was patched in ALAS2023-2025-809.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-libbpf-static package and not the kernel-libbpf-static package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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

bpf,perf: Fix invalid prog_array access in perf_event_detach_bpf_prog

Syzbot reported [1] crash that happens for following tracing scenario:

  • create tracepoint perf event with attr.inherit=1, attach it to the process and set bpf program to it

  • attached process forks -> chid creates inherited event

    the new child event shares the parent's bpf program and tp_event (hence prog_array) which is global for tracepoint

  • exit both process and its child -> release both events

  • first perf_event_detach_bpf_prog call will release tp_event->prog_array and second perf_event_detach_bpf_prog will crash, because tp_event->prog_array is NULL

The fix makes sure the perf_event_detach_bpf_prog checks prog_array is valid before it tries to remove the bpf program from it.

[1] https://lore.kernel.org/bpf/Z1MR6dCIKajNS6nU@krava/T/#m91dbf0688221ec7a7fc95e896a7ef9ff93b0b8ad

CVSS Base Scores

version 3.1