What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-01-08 · updated 2026-06-17
• Weakness: CWE-476

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().

Affected products

• Linux kernel: from 5.11 before 5.15.174; from 5.16 before 6.1.120; from 6.2 before 6.6.64; from 6.7 before 6.12.4; 6.13-rc1 — fixed in 5.15.174, 6.1.120, 6.12.4, 6.6.64

How to fix

Upgrade to a fixed version: Linux kernel 5.15.174, 6.1.120, 6.12.4, 6.6.64. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3ed51857a50f530ac7a1482e069dfbd1298558d4
• https://git.kernel.org/stable/c/757171d1369b3b47f36932d40a05a0715496dcab
• https://git.kernel.org/stable/c/93992c3d9629b02dccf6849238559d5c24f2dece
• https://git.kernel.org/stable/c/c71d114ef68c95da5a82ec85a721ab31f5bd905b
• https://git.kernel.org/stable/c/db66fb87c21e8ae724886e6a464dcbac562a64c6
• https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html

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