CVE-2024-44963: Linux kernel · btrfs: do not BUG_ON() when freeing tree block after error
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 15:18 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 4 Sep 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
AI-suggested
A fix has been implemented in the Linux kernel to handle errors properly by returning them instead of triggering a BUG_ON(). Users should update to the fixed kernel version once available. Since this is a kernel-level issue, applying the official kernel patch or upgrading to a kernel version that includes this fix is the recommended mitigation.
Description
CVE-2024-44963 is a vulnerability in the Linux kernel's btrfs filesystem code where an error during freeing a tree block could cause the kernel to BUG_ON(), leading to a kernel panic. This occurs because error handling for delayed references was incomplete, especially when quota groups (qgroups) are enabled, allowing errors other than -ENOMEM to propagate. The fix changes the code to return errors properly and abort the transaction to prevent space leaks.
References
- git.kernel.org/stable/c/bfcef12f80b3a9bd6b09c7305679164e3307328a (opens in a new tab)
- git.kernel.org/stable/c/22d907bcd283d69d5e60497fc0d51969545c583b (opens in a new tab)
- git.kernel.org/stable/c/98251cd60b4d702a8a81de442ab621e83a3fb24f (opens in a new tab)
- git.kernel.org/stable/c/bb3868033a4cccff7be57e9145f2117cbdc91c11 (opens in a new tab)