NULL Pointer Dereference Affecting kernel-devel package, versions <0:6.1.124-134.200.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-AMZN2023-KERNELDEVEL-9524015
  • published27 Mar 2025
  • disclosed8 Jan 2025

Introduced: 8 Jan 2025

CVE-2024-56774  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel-devel 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-devel package and not the kernel-devel 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: add a sanity check for btrfs root in btrfs_search_slot()

Syzbot reports a null-ptr-deref in btrfs_search_slot().

The reproducer is using rescue=ibadroots, and the extent tree root is corrupted thus the extent tree is NULL.

When scrub tries to search the extent tree to gather the needed extent info, btrfs_search_slot() doesn't check if the target root is NULL or not, resulting the null-ptr-deref.

Add sanity check for btrfs root before using it in btrfs_search_slot().

CVSS Base Scores

version 3.1