Use After Free Affecting kernel-libbpf-static package, versions <0:6.1.96-102.177.amzn2023


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-AMZN2023-KERNELLIBBPFSTATIC-9296963
  • published7 Mar 2025
  • disclosed12 Jul 2024

Introduced: 12 Jul 2024

CVE-2024-39496  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel-libbpf-static to version 0:6.1.96-102.177.amzn2023 or higher.
This issue was patched in ALAS2023-2025-836.

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:

btrfs: zoned: fix use-after-free due to race with dev replace

While loading a zone's info during creation of a block group, we can race with a device replace operation and then trigger a use-after-free on the device that was just replaced (source device of the replace operation).

This happens because at btrfs_load_zone_info() we extract a device from the chunk map into a local variable and then use the device while not under the protection of the device replace rwsem. So if there's a device replace operation happening when we extract the device and that device is the source of the replace operation, we will trigger a use-after-free if before we finish using the device the replace operation finishes and frees the device.

Fix this by enlarging the critical section under the protection of the device replace rwsem so that all uses of the device are done inside the critical section.

CVSS Base Scores

version 3.1