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VulnerabilityPublished Updated

CVE-2024-35784: Linux kernel · btrfs: fix deadlock with fiemap and extent locking

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 30 Oct 2026, 16:33 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 17 May 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 for this deadlock vulnerability has been implemented in the Linux kernel. Users should update to the fixed kernel version once available. Since this is a kernel-level fix, applying the official kernel update from the Linux vendor or distribution is the recommended remediation. No additional mitigation steps are indicated.

Description

CVE-2024-35784 is a deadlock vulnerability in the Linux kernel's btrfs filesystem related to extent locking during the fiemap ioctl operation. The issue occurs because the extent lock is held for the entire fiemap range, which can lead to a deadlock when page faults happen during copying extents to user space. The fix involves reducing the lock duration to avoid holding the extent lock throughout the entire fiemap operation while maintaining consistency when checking delayed allocations.

References

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