CVE-2024-56774 btrfs: add a sanity check for btrfs root in btrfs_search_slot()

What is CVE-2024-56774?

CVE-2024-56774 is a medium-severity vulnerability in Linux kernel, published on 8 Jan 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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().

Weakness: CWE-476

Which versions are affected by CVE-2024-56774?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-56774?

Apply the vendor's patch.

Is CVE-2024-56774 being exploited?

There is no known exploitation of CVE-2024-56774 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-55334, AZL-55369, BELL-CVE-2024-56774, DEBIAN-CVE-2024-56774, GHSA-phf7-cpqm-749x, UBUNTU-CVE-2024-56774.