---
cve: "CVE-2024-44963"
severity: "LOW"
cvss: 3.1
epss: "24%"
vendor: "Linux"
kev: false
exploited: false
published: "2024-09-04 19:15:30"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T16:25:14+02:00"
---

# CVE-2024-44963

> 3.1 LOW

## Beschreibung

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

btrfs: do not BUG_ON() when freeing tree block after error

When freeing a tree block, at btrfs_free_tree_block(), if we fail to
create a delayed reference we don't deal with the error and just do a
BUG_ON(). The error most likely to happen is -ENOMEM, and we have a
comment mentioning that only -ENOMEM can happen, but that is not true,
because in case qgroups are enabled any error returned from
btrfs_qgroup_trace_extent_post() (can be -EUCLEAN or anything returned
from btrfs_search_slot() for example) can be propagated back to
btrfs_free_tree_block().

So stop doing a BUG_ON() and return the error to the callers and make
them abort the transaction to prevent leaking space. Syzbot was
triggering this, likely due to memory allocation failure injection.

## Patch verfügbar (OSV)

- Kernel ≥ 6.6.64
- Kernel ≥ 6.10.5

## Referenzen

- <https://git.kernel.org/stable/c/22d907bcd283d69d5e60497fc0d51969545c583b>
- <https://git.kernel.org/stable/c/98251cd60b4d702a8a81de442ab621e83a3fb24f>
- <https://git.kernel.org/stable/c/bb3868033a4cccff7be57e9145f2117cbdc91c11>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2024-44963) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_