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VulnerabilityPublished Updated

CVE-2024-44963: Linux kernel · btrfs: do not BUG_ON() when freeing tree block after error

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 30 Oct 2026, 15:18 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Sep 2024

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

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