CVE-2024-57255

Code execution via SquashFS symlink integer overflow

Published Feb 18, 2025 · Updated Nov 3, 2025

Integer overflow in U-Boot before 2025.01-rc1 allows physically proximate attackers to overwrite memory via a crafted SquashFS filesystem. sqfs_resolve_symlink adds one to an untrusted 32-bit symlink size without overflow checking, allocates zero bytes at 0xffffffff, then copies data into that allocation. Exploitation requires control of filesystem data structures and can execute code or bypass verified boot on systems that trust U-Boot to preserve the boot chain.

CVSS severity7.1
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in U-Boot before 2025.01-rc1 allows physically proximate attackers to overwrite memory via a crafted SquashFS filesystem. sqfs_resolve_symlink adds one to an untrusted 32-bit symlink size without overflow checking, allocates zero bytes at 0xffffffff, then copies data into that allocation. Exploitation requires control of filesystem data structures and can execute code or bypass verified boot on systems that trust U-Boot to preserve the boot chain.

The record

CVE
CVE-2024-57255
Published
Feb 18, 2025
Updated
Nov 3, 2025
Vendor
DENX Software Engineering GmbH
Product
U-Boot
Classifications
CWE-190
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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=0 <2025.01-rc1

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

DENX Software Engineering GmbH · U-Bootversion=0 <2025.01-rc1

Published CVSS scores

7.1MITRECVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
6.8NVDCVSS:3.1/AV:P/AC:L/PR:N/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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound

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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