CVE-2024-31955Public exploit

Unauthorized RPMB writes via glitched HMAC verification

Published Oct 15, 2024 · Updated Oct 30, 2024

Authentication bypass in Samsung KLMAG2GE4A and KLM8G1WEMB eMMC firmware allows physically proximate attackers to overwrite RPMB data. A precisely timed electromagnetic pulse disrupts the controller's rpmb_check_hmac result, causing a write packet with an invalid HMAC to be accepted. Physical chip access, precise probe positioning, and EMFI equipment are required; successful exploitation alters integrity-protected data without the pre-shared key.

CVSS severity4.9
Medium
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

Authentication bypass in Samsung KLMAG2GE4A and KLM8G1WEMB eMMC firmware allows physically proximate attackers to overwrite RPMB data. A precisely timed electromagnetic pulse disrupts the controller's rpmb_check_hmac result, causing a write packet with an invalid HMAC to be accepted. Physical chip access, precise probe positioning, and EMFI equipment are required; successful exploitation alters integrity-protected data without the pre-shared key.

The record

CVE
CVE-2024-31955
Published
Oct 15, 2024
Updated
Oct 30, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-295, T1565.001
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 2024Record 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 vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.9MITRECVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1565.001Stored Data Manipulation

Public exploit references

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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