CVE-2024-56548

Kernel corruption via changing loop-device block size

Published Dec 27, 2024 · Updated Aug 5, 2026

Out-of-bounds write in Linux hfsplus allows local users to corrupt kernel memory while mounting an HFS+ image on a loop device. hfsplus_read_wrapper allocates a buffer using one logical block size, but hfsplus_submit_bio can reread a changed size and write beyond that allocation. Exploitation requires local access to mount the image and concurrently issue LOOP_SET_BLOCK_SIZE on a writable loop-device descriptor; successful corruption can panic the kernel or enable privilege escalation.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux hfsplus allows local users to corrupt kernel memory while mounting an HFS+ image on a loop device. hfsplus_read_wrapper allocates a buffer using one logical block size, but hfsplus_submit_bio can reread a changed size and write beyond that allocation. Exploitation requires local access to mount the image and concurrently issue LOOP_SET_BLOCK_SIZE on a writable loop-device descriptor; successful corruption can panic the kernel or enable privilege escalation.

The record

CVE
CVE-2024-56548
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 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=3.0.8 <3.1
  2. Affected versionversion=3.1
  3. Affected versionversion=6596528e391ad978a6a120142cba97a1d7324cb6 <06cbfbb13ac88f4154c2eb4bc4176f9d10139847
  4. Affected versionversion=6596528e391ad978a6a120142cba97a1d7324cb6 <1c82587cb57687de3f18ab4b98a8850c789bedcf
  5. Affected versionversion=6596528e391ad978a6a120142cba97a1d7324cb6 <21900e8478126ff6afe3b66679f676e74d1f8830
  6. Affected versionversion=6596528e391ad978a6a120142cba97a1d7324cb6 <2667c9b7b76efcbc7adbfea249892f20c313b0da
  7. Affected versionversion=6596528e391ad978a6a120142cba97a1d7324cb6 <3d7bda75e1a6239db053c73acde17ca146317824
  8. Affected versionversion=6596528e391ad978a6a120142cba97a1d7324cb6 <baccb5e12577b7a9eff54ffba301fdaa0f3ee5a8
  9. Affected versionversion=6596528e391ad978a6a120142cba97a1d7324cb6 <bfeecda050aa9376f642d5b2a71c4112cc6c8216
  10. Affected versionversion=6596528e391ad978a6a120142cba97a1d7324cb6 <e8a2b1c1c2ea85e9a5a2d0c5a5a7e7c639feb866
  11. Affected versionversion=6596528e391ad978a6a120142cba97a1d7324cb6 <f57725bcc5816425e25218fdf5fb6923bc578cdf
  12. Affected versionversion=c53c89aba3ebdfc3e9acdb18bb5ee9d2f8a328d0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.0.8 <3.1; version=3.1; version=6596528e391ad978a6a120142cba97a1d7324cb6 <06cbfbb13ac88f4154c2eb4bc4176f9d10139847; version=6596528e391ad978a6a120142cba97a1d7324cb6 <1c82587cb57687de3f18ab4b98a8850c789bedcf; version=6596528e391ad978a6a120142cba97a1d7324cb6 <21900e8478126ff6afe3b66679f676e74d1f8830; version=6596528e391ad978a6a120142cba97a1d7324cb6 <2667c9b7b76efcbc7adbfea249892f20c313b0da; version=6596528e391ad978a6a120142cba97a1d7324cb6 <3d7bda75e1a6239db053c73acde17ca146317824; version=6596528e391ad978a6a120142cba97a1d7324cb6 <baccb5e12577b7a9eff54ffba301fdaa0f3ee5a8; version=6596528e391ad978a6a120142cba97a1d7324cb6 <bfeecda050aa9376f642d5b2a71c4112cc6c8216; version=6596528e391ad978a6a120142cba97a1d7324cb6 <e8a2b1c1c2ea85e9a5a2d0c5a5a7e7c639feb866; version=6596528e391ad978a6a120142cba97a1d7324cb6 <f57725bcc5816425e25218fdf5fb6923bc578cdf; version=c53c89aba3ebdfc3e9acdb18bb5ee9d2f8a328d0

Published CVSS scores

7.8Linux Kernel CNACVSS: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 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

T1068Exploitation for Privilege Escalation

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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