CVE-2024-56750

Kernel panic via undersized file-backed EROFS blocks

Published Dec 29, 2024 · Updated May 11, 2026

Denial of service in Linux EROFS 6.12 allows local users to panic the kernel by mounting a file-backed image with small blocks. The EROFS fill-super path passes the image block size to sb_set_blocksize even when no block device backs the mount, causing a sub-page block size to trigger a kernel panic. Exploitation requires local access and a file-backed EROFS mount whose filesystem block size is smaller than PAGE_SIZE; the documented consequence is a host-wide crash without data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux EROFS 6.12 allows local users to panic the kernel by mounting a file-backed image with small blocks. The EROFS fill-super path passes the image block size to sb_set_blocksize even when no block device backs the mount, causing a sub-page block size to trigger a kernel panic. Exploitation requires local access and a file-backed EROFS mount whose filesystem block size is smaller than PAGE_SIZE; the documented consequence is a host-wide crash without data disclosure or modification.

The record

CVE
CVE-2024-56750
Published
Dec 29, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 29, 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=6.12
  2. Affected versionversion=fb176750266a3d7f42ebdcf28e8ba40350b27847 <679d8537e5748241c71ac97a6b6dc919eae31716
  3. Affected versionversion=fb176750266a3d7f42ebdcf28e8ba40350b27847 <bae0854160939a64a092516ff1b2f221402b843b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.12; version=fb176750266a3d7f42ebdcf28e8ba40350b27847 <679d8537e5748241c71ac97a6b6dc919eae31716; version=fb176750266a3d7f42ebdcf28e8ba40350b27847 <bae0854160939a64a092516ff1b2f221402b843b

Published CVSS scores

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

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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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