CVE-2024-26772

Filesystem corruption via unlocked block-bitmap check

Published Apr 3, 2024 · Updated Aug 5, 2026

Race condition in the Linux kernel's ext4 allocator allows local users to disclose or corrupt filesystem data and crash the kernel. ext4_mb_find_by_goal() checks EXT4_GROUP_INFO_BBITMAP_CORRUPT before taking the group lock, allowing a concurrent corruption update to be missed and blocks from a known-corrupt group to be allocated. An unprivileged account with a writable directory on a mounted ext4 filesystem can race its own file operations, causing cross-file data exposure or modification, read-only remounts, ENOSPC, or a kernel panic.

CVSS severity7.8
High
EPSS probability0.26%
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 kernel's ext4 allocator allows local users to disclose or corrupt filesystem data and crash the kernel. ext4_mb_find_by_goal() checks EXT4_GROUP_INFO_BBITMAP_CORRUPT before taking the group lock, allowing a concurrent corruption update to be missed and blocks from a known-corrupt group to be allocated. An unprivileged account with a writable directory on a mounted ext4 filesystem can race its own file operations, causing cross-file data exposure or modification, read-only remounts, ENOSPC, or a kernel panic.

The record

CVE
CVE-2024-26772
Published
Apr 3, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <21dbe20589c7f48e9c5d336ce6402bcebfa6d76a
  2. Affected versionversion=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <5a6dcc4ad0f7f7fa8e8d127b5526e7c5f2d38a43
  3. Affected versionversion=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <6b92b1bc16d691c95b152c6dbf027ad64315668d
  4. Affected versionversion=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <832698373a25950942c04a512daa652c18a9b513
  5. Affected versionversion=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <8de8305a25bfda607fc13475ebe84b978c96d7ff
  6. Affected versionversion=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <d3bbe77a76bc52e9d4d0a120f1509be36e25c916
  7. Affected versionversion=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <d639102f4cbd4cb65d1225dba3b9265596aab586
  8. Affected versionversion=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <ffeb72a80a82aba59a6774b0611f792e0ed3b0b7
  9. Affected versionversion=3.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <21dbe20589c7f48e9c5d336ce6402bcebfa6d76a; version=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <5a6dcc4ad0f7f7fa8e8d127b5526e7c5f2d38a43; version=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <6b92b1bc16d691c95b152c6dbf027ad64315668d; version=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <832698373a25950942c04a512daa652c18a9b513; version=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <8de8305a25bfda607fc13475ebe84b978c96d7ff; version=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <d3bbe77a76bc52e9d4d0a120f1509be36e25c916; version=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <d639102f4cbd4cb65d1225dba3b9265596aab586; version=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <ffeb72a80a82aba59a6774b0611f792e0ed3b0b7; version=3.12

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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