CVE-2026-64540

Kernel heap disclosure via unchecked packet length

Published Jul 27, 2026 · Updated Jul 27, 2026

Out-of-bounds read in the Linux Kernel GL620A USB driver allows remote attackers to disclose kernel heap data over an attached cable. genelink_rx_fixup() trusts a device-supplied packet length bounded only by 1514 bytes and copies that amount before verifying the received buffer contains it. A malicious peer on an active GeneLink host-to-host cable can receive adjacent slab contents, and an over-read into unmapped memory can also panic the host.

CVSS severity8.1
High
EPSS probability0.27%
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

Out-of-bounds read in the Linux Kernel GL620A USB driver allows remote attackers to disclose kernel heap data over an attached cable. genelink_rx_fixup() trusts a device-supplied packet length bounded only by 1514 bytes and copies that amount before verifying the received buffer contains it. A malicious peer on an active GeneLink host-to-host cable can receive adjacent slab contents, and an over-read into unmapped memory can also panic the host.

The record

CVE
CVE-2026-64540
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1200
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 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=2.6.14
  2. Affected versionversion=47ee3051c856cc2aa95d35d577a8cb37279d540f <0575599e451aff3c5329922562374a2cab25fc51
  3. Affected versionversion=47ee3051c856cc2aa95d35d577a8cb37279d540f <0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db
  4. Affected versionversion=47ee3051c856cc2aa95d35d577a8cb37279d540f <255d03551f94c7bdd86c7d9181a70b21917d829f
  5. Affected versionversion=47ee3051c856cc2aa95d35d577a8cb37279d540f <3ef79fa3860e644c8de7834fa7300e1c58f38862
  6. Affected versionversion=47ee3051c856cc2aa95d35d577a8cb37279d540f <4359376e6238d89977a35086e47ca3b07f43e850
  7. Affected versionversion=47ee3051c856cc2aa95d35d577a8cb37279d540f <573418f7ea8f859a841417eb4b915594094fd967
  8. Affected versionversion=47ee3051c856cc2aa95d35d577a8cb37279d540f <8624e179fa3ce23c2fbd1a198ce30764b73f054a
  9. Affected versionversion=47ee3051c856cc2aa95d35d577a8cb37279d540f <8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.14; version=47ee3051c856cc2aa95d35d577a8cb37279d540f <0575599e451aff3c5329922562374a2cab25fc51; version=47ee3051c856cc2aa95d35d577a8cb37279d540f <0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db; version=47ee3051c856cc2aa95d35d577a8cb37279d540f <255d03551f94c7bdd86c7d9181a70b21917d829f; version=47ee3051c856cc2aa95d35d577a8cb37279d540f <3ef79fa3860e644c8de7834fa7300e1c58f38862; version=47ee3051c856cc2aa95d35d577a8cb37279d540f <4359376e6238d89977a35086e47ca3b07f43e850; version=47ee3051c856cc2aa95d35d577a8cb37279d540f <573418f7ea8f859a841417eb4b915594094fd967; version=47ee3051c856cc2aa95d35d577a8cb37279d540f <8624e179fa3ce23c2fbd1a198ce30764b73f054a; version=47ee3051c856cc2aa95d35d577a8cb37279d540f <8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a

Published CVSS scores

8.1Linux Kernel CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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