CVE-2026-64208Network attack vector

Service interruption via missing RxGK length checks

Published Jul 24, 2026 · Updated Jul 24, 2026

Denial of service in Linux Kernel 6.16 allows remote attackers to disrupt RxGK-secured AF_RXRPC calls with undersized DATA packets. AF_RXRPC subtracts Kerberos checksum or encryption overhead from packet lengths, or starts decryption, without first proving that the secure blob can contain the overhead and required header. No privileges or user interaction are required, but RxGK-secured packet processing must be reachable and published sources do not define the disruption's wider service scope.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux Kernel 6.16 allows remote attackers to disrupt RxGK-secured AF_RXRPC calls with undersized DATA packets. AF_RXRPC subtracts Kerberos checksum or encryption overhead from packet lengths, or starts decryption, without first proving that the secure blob can contain the overhead and required header. No privileges or user interaction are required, but RxGK-secured packet processing must be reachable and published sources do not define the disruption's wider service scope.

The record

CVE
CVE-2026-64208
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 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=6.16
  2. Affected versionversion=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <2b50aceafe6606ea52ed42aadd1b4d44a188aade
  3. Affected versionversion=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <585f9f6aef5c4542ac9d6ec45cd7dbc7df9af3ff
  4. Affected versionversion=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <9217017f4bce53dddb8d547837f1f707045d64ad

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.16; version=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <2b50aceafe6606ea52ed42aadd1b4d44a188aade; version=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <585f9f6aef5c4542ac9d6ec45cd7dbc7df9af3ff; version=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <9217017f4bce53dddb8d547837f1f707045d64ad

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service Application or System Exploitation

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

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Your stack

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