CVE-2026-80652

Local kernel crash via zero-length certificate chain

Published Aug 28, 2026 · Updated Aug 28, 2026

Denial of service in the CCP SEV PDH export ioctl in Linux allows local users to crash kernels built with CONFIG_DEBUG_VIRTUAL. sev_ioctl_do_pdh_export allocates a zero-byte certificate-chain buffer, receives ZERO_SIZE_PTR from kzalloc(), and passes it to physical-address translation instead of treating it as a blob-length query. Reaching the crash requires access to the host SEV ioctl on AMD SEV hardware and a kernel built with CONFIG_DEBUG_VIRTUAL; other builds fail benignly before any write.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
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

Denial of service in the CCP SEV PDH export ioctl in Linux allows local users to crash kernels built with CONFIG_DEBUG_VIRTUAL. sev_ioctl_do_pdh_export allocates a zero-byte certificate-chain buffer, receives ZERO_SIZE_PTR from kzalloc(), and passes it to physical-address translation instead of treating it as a blob-length query. Reaching the crash requires access to the host SEV ioctl on AMD SEV hardware and a kernel built with CONFIG_DEBUG_VIRTUAL; other builds fail benignly before any write.

The record

CVE
CVE-2026-80652
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=4.16
  2. Affected versionversion=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <13b4d5e055d344e34b864bced0a591ceaac7ad81
  3. Affected versionversion=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <1c587f30c6242cc37b3d6ee6d91daef84e51633f
  4. Affected versionversion=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <21650fe221ea9b72809140b691589dde8bff3eab
  5. Affected versionversion=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <50c3c7df4f26d36b30bc950a7d780f7029fd52f8
  6. Affected versionversion=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <94344bc7c9d70b04be718d841b92873aa3ea8191
  7. Affected versionversion=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <d88071a6ce091272726bedda26c105b85b23705f
  8. Affected versionversion=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <ee717e73ab47253c82c134c342e32fcdfcfccd87
  9. Affected versionversion=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <ef8c9dacda2871accd64e3eda951fef6b788b1ea

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.16; version=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <13b4d5e055d344e34b864bced0a591ceaac7ad81; version=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <1c587f30c6242cc37b3d6ee6d91daef84e51633f; version=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <21650fe221ea9b72809140b691589dde8bff3eab; version=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <50c3c7df4f26d36b30bc950a7d780f7029fd52f8; version=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <94344bc7c9d70b04be718d841b92873aa3ea8191; version=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <d88071a6ce091272726bedda26c105b85b23705f; version=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <ee717e73ab47253c82c134c342e32fcdfcfccd87; version=76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 <ef8c9dacda2871accd64e3eda951fef6b788b1ea

Published CVSS scores

No CVSS assessment is available in this record.

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application 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

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