CVE-2023-53125

Kernel memory disclosure via unchecked packet length

Published May 2, 2025 · Updated May 11, 2026

Information disclosure in the Linux kernel smsc75xx USB network driver allows attackers to expose kernel memory via malformed packet metadata. The smsc75xx_rx_fixup function checked a packet-derived size against only the protocol maximum, then passed a cloned buffer up the network stack without ensuring that size was within skb->len. Reachability requires the smsc75xx receive path and packet metadata claiming more bytes than the socket buffer actually contains.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux kernel smsc75xx USB network driver allows attackers to expose kernel memory via malformed packet metadata. The smsc75xx_rx_fixup function checked a packet-derived size against only the protocol maximum, then passed a cloned buffer up the network stack without ensuring that size was within skb->len. Reachability requires the smsc75xx receive path and packet metadata claiming more bytes than the socket buffer actually contains.

The record

CVE
CVE-2023-53125
Published
May 2, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.34
  2. Affected versionversion=d0cad871703b898a442e4049c532ec39168e5b57 <105db6574281e1e03fcbf87983f4fee111682306
  3. Affected versionversion=d0cad871703b898a442e4049c532ec39168e5b57 <4a4de0a68b18485c68ab4f0cfa665b1633c6d277
  4. Affected versionversion=d0cad871703b898a442e4049c532ec39168e5b57 <53966d572d056d6b234cfe76a5f9d60049d3c178
  5. Affected versionversion=d0cad871703b898a442e4049c532ec39168e5b57 <8ee5df9c039e37b9d8eb5e3de08bfb7f53d31cb6
  6. Affected versionversion=d0cad871703b898a442e4049c532ec39168e5b57 <9fabdd79051a9fe51388df099aff6e4b660fedd2
  7. Affected versionversion=d0cad871703b898a442e4049c532ec39168e5b57 <c7bdc137ca163b90917c1eeba4f1937684bd4f8b
  8. Affected versionversion=d0cad871703b898a442e4049c532ec39168e5b57 <d8b228318935044dafe3a5bc07ee71a1f1424b8d
  9. Affected versionversion=d0cad871703b898a442e4049c532ec39168e5b57 <e294f0aa47e4844f3d3c8766c02accd5a76a7d4e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.34; version=d0cad871703b898a442e4049c532ec39168e5b57 <105db6574281e1e03fcbf87983f4fee111682306; version=d0cad871703b898a442e4049c532ec39168e5b57 <4a4de0a68b18485c68ab4f0cfa665b1633c6d277; version=d0cad871703b898a442e4049c532ec39168e5b57 <53966d572d056d6b234cfe76a5f9d60049d3c178; version=d0cad871703b898a442e4049c532ec39168e5b57 <8ee5df9c039e37b9d8eb5e3de08bfb7f53d31cb6; version=d0cad871703b898a442e4049c532ec39168e5b57 <9fabdd79051a9fe51388df099aff6e4b660fedd2; version=d0cad871703b898a442e4049c532ec39168e5b57 <c7bdc137ca163b90917c1eeba4f1937684bd4f8b; version=d0cad871703b898a442e4049c532ec39168e5b57 <d8b228318935044dafe3a5bc07ee71a1f1424b8d; version=d0cad871703b898a442e4049c532ec39168e5b57 <e294f0aa47e4844f3d3c8766c02accd5a76a7d4e

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5OracleCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 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

See the directory against your own environment.

Your stack

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