CVE-2026-64571

Kernel heap disclosure via truncated EEPROM readback

Published Aug 5, 2026 · Updated Aug 5, 2026

An out-of-bounds read in the Linux p54 USB driver allows physically proximate attackers to disclose adjacent kernel heap data. p54_rx_eeprom_readback() trusts the advertised EEPROM slice length and calls memcpy() without confirming that the device-supplied skb contains the full payload. Exploitation requires a malicious USB device that impersonates a supported p54 adapter; the demonstrated consequence is disclosure of adjacent heap memory.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

An out-of-bounds read in the Linux p54 USB driver allows physically proximate attackers to disclose adjacent kernel heap data. p54_rx_eeprom_readback() trusts the advertised EEPROM slice length and calls memcpy() without confirming that the device-supplied skb contains the full payload. Exploitation requires a malicious USB device that impersonates a supported p54 adapter; the demonstrated consequence is disclosure of adjacent heap memory.

The record

CVE
CVE-2026-64571
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1200
Attack vector
physical
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=2.6.28
  2. Affected versionversion=7cb770729ba895f73253dfcd46c3fcba45d896f9 <25c3b85af3fc4f8043159b14e65790fc3bbdaf48
  3. Affected versionversion=7cb770729ba895f73253dfcd46c3fcba45d896f9 <9096e1f7014174067239a63df18ae5f28301990d
  4. Affected versionversion=7cb770729ba895f73253dfcd46c3fcba45d896f9 <d38f5d868a0a4770e3bcd0925e16c46acdbc9509
  5. Affected versionversion=7cb770729ba895f73253dfcd46c3fcba45d896f9 <ebd6d37fa94bee929e0b4c9ca19fdf9b1dcf6cea
  6. Affected versionversion=7cb770729ba895f73253dfcd46c3fcba45d896f9 <f46f8f9c43fd02f4dd5f716d4bda296a523c04f0

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.28; version=7cb770729ba895f73253dfcd46c3fcba45d896f9 <25c3b85af3fc4f8043159b14e65790fc3bbdaf48; version=7cb770729ba895f73253dfcd46c3fcba45d896f9 <9096e1f7014174067239a63df18ae5f28301990d; version=7cb770729ba895f73253dfcd46c3fcba45d896f9 <d38f5d868a0a4770e3bcd0925e16c46acdbc9509; version=7cb770729ba895f73253dfcd46c3fcba45d896f9 <ebd6d37fa94bee929e0b4c9ca19fdf9b1dcf6cea; version=7cb770729ba895f73253dfcd46c3fcba45d896f9 <f46f8f9c43fd02f4dd5f716d4bda296a523c04f0

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.

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

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1200Hardware Additions

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

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo