CVE-2023-30257Public exploit

Root code execution via procfs stack overflow

Published May 8, 2023 · Updated Jan 29, 2025

Stack-based buffer overflow in the FiiO M6 1.0.4 touchscreen debug interface allows local users to execute code as root. The globally writable /proc/ftxxxx-debug handler passes an unchecked user-supplied length to copy_from_user, overflowing a 128-byte kernel stack buffer. Any local shell user can write the entry; the demonstrated exploit replaces the saved return path and uevent_helper to launch a root shell.

CVSS severity7.8
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

Stack-based buffer overflow in the FiiO M6 1.0.4 touchscreen debug interface allows local users to execute code as root. The globally writable /proc/ftxxxx-debug handler passes an unchecked user-supplied length to copy_from_user, overflowing a 128-byte kernel stack buffer. Any local shell user can write the entry; the demonstrated exploit replaces the saved return path and uevent_helper to launch a root shell.

The record

CVE
CVE-2023-30257
Published
May 8, 2023
Updated
Jan 29, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1404
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1404Exploitation for Privilege Escalation

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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