CVE-2025-70293

Code execution via ext4 descriptor-table under-allocation

Published Aug 26, 2026 · Updated Aug 26, 2026

Integer overflow in DENX U-Boot before 2026.04 allows attackers to execute code or interrupt boot via a crafted ext4 filesystem. ext4fs_get_bgdtable multiplies the untrusted block-group count by descriptor size without overflow checking, allocates the wrapped size, then reads the full descriptor table into the undersized heap buffer. Exploitation requires control of an ext4 filesystem parsed by U-Boot; successful corruption grants code execution in the bootloader context or interrupts the boot process.

CVSS severityUnavailable
Unscored
EPSS probability0.53%
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 DENX U-Boot before 2026.04 allows attackers to execute code or interrupt boot via a crafted ext4 filesystem. ext4fs_get_bgdtable multiplies the untrusted block-group count by descriptor size without overflow checking, allocates the wrapped size, then reads the full descriptor table into the undersized heap buffer. Exploitation requires control of an ext4 filesystem parsed by U-Boot; successful corruption grants code execution in the bootloader context or interrupts the boot process.

The record

CVE
CVE-2025-70293
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound

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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