CVE-2026-71974

Bootloader memory corruption via oversized Android image read

Published Sep 29, 2026 · Updated Sep 29, 2026

Out-of-bounds write in U-Boot before 2026.10-rc3 allows physically proximate attackers to corrupt bootloader memory via crafted Android boot media. In read_slotted_partition(), a header-derived image size sets the block-read length without a check against the partition size, so the read writes beyond the load buffer. Exploitation requires attacker-supplied boot media and a device where Android Verified Boot does not gate the read, such as an unlocked device.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in U-Boot before 2026.10-rc3 allows physically proximate attackers to corrupt bootloader memory via crafted Android boot media. In read_slotted_partition(), a header-derived image size sets the block-read length without a check against the partition size, so the read writes beyond the load buffer. Exploitation requires attacker-supplied boot media and a device where Android Verified Boot does not gate the read, such as an unlocked device.

The record

CVE
CVE-2026-71974
Published
Sep 29, 2026
Updated
Sep 29, 2026
Vendor
DENX Software Engineering GmbH
Product
U-Boot
Classifications
Unavailable
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 29, 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=0 <2026.10-rc3

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

DENX Software Engineering GmbH · U-Bootversion=0 <2026.10-rc3

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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