CVE-2024-27080

Data loss via stale FIEMAP extent view

Published May 1, 2024 · Updated May 23, 2026

Race condition in the Linux btrfs FIEMAP path allows local users to cause data loss through unsynchronized extent inspection. FIEMAP scans a cloned extent-tree leaf without locking the full target range, so a concurrently completed delayed allocation disappears from both the clone and the in-memory delalloc state and is reported as a hole. An affected system must use btrfs and issue FIEMAP without synchronization during the race; sparse-copy consumers can then omit real file data.

CVSS severity4.7
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux btrfs FIEMAP path allows local users to cause data loss through unsynchronized extent inspection. FIEMAP scans a cloned extent-tree leaf without locking the full target range, so a concurrently completed delayed allocation disappears from both the clone and the in-memory delalloc state and is reported as a hole. An affected system must use btrfs and issue FIEMAP without synchronization during the race; sparse-copy consumers can then omit real file data.

The record

CVE
CVE-2024-27080
Published
May 1, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.6.24 <6.6.26
  2. Affected versionversion=6.7.12 <6.8
  3. Affected versionversion=6.8
  4. Affected versionversion=89bca7fe6382d61e88c67a0b0e7bce315986fb8b
  5. Affected versionversion=b0ad381fa7690244802aed119b478b4bdafc31dd <978b63f7464abcfd364a6c95f734282c50f3decf
  6. Affected versionversion=b0ad381fa7690244802aed119b478b4bdafc31dd <ced63fffd63072c0ca55d5a451010d71bf08c0b3
  7. Affected versionversion=ded566b4637f1b6b4c9ba74e7d0b8493e93f19cf <49d640d2946c35a17b051d54171a032dd95b0f50

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6.24 <6.6.26; version=6.7.12 <6.8; version=6.8; version=89bca7fe6382d61e88c67a0b0e7bce315986fb8b; version=b0ad381fa7690244802aed119b478b4bdafc31dd <978b63f7464abcfd364a6c95f734282c50f3decf; version=b0ad381fa7690244802aed119b478b4bdafc31dd <ced63fffd63072c0ca55d5a451010d71bf08c0b3; version=ded566b4637f1b6b4c9ba74e7d0b8493e93f19cf <49d640d2946c35a17b051d54171a032dd95b0f50

Published CVSS scores

4.7UbuntuCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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