CVE-2024-42231

Local storage exhaustion via misaligned free-space accounting

Published Jul 30, 2024 · Updated May 11, 2026

Availability flaw in zoned Btrfs in Linux 6.7 allows local users to exhaust allocatable space and trigger ENOSPC during writes. calc_available_free_space() uses an incorrect data chunk size and returns a non-zone-aligned byte count, overstating metadata or system space available for allocation. The condition requires zoned mode on a nearly full, large-zone device; reduced asynchronous metadata reclaim then leaves writes unable to allocate space.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Availability flaw in zoned Btrfs in Linux 6.7 allows local users to exhaust allocatable space and trigger ENOSPC during writes. calc_available_free_space() uses an incorrect data chunk size and returns a non-zone-aligned byte count, overstating metadata or system space available for allocation. The condition requires zoned mode on a nearly full, large-zone device; reduced asynchronous metadata reclaim then leaves writes unable to allocate space.

The record

CVE
CVE-2024-42231
Published
Jul 30, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 30, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=6.7
  2. Affected versionversion=cb6cbab79055ca207ad88bc54226b48ececdcef0 <64d2c847ba380e07b9072d65a50aa6469d2aa43f
  3. Affected versionversion=cb6cbab79055ca207ad88bc54226b48ececdcef0 <8548903b1999bba02a2b894ad750ab8eb1f40307

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=cb6cbab79055ca207ad88bc54226b48ececdcef0 <64d2c847ba380e07b9072d65a50aa6469d2aa43f; version=cb6cbab79055ca207ad88bc54226b48ececdcef0 <8548903b1999bba02a2b894ad750ab8eb1f40307

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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