CVE-2026-63937

Guest-to-host compromise via racy PSC buffer rereads

Published Jul 19, 2026 · Updated Jul 19, 2026

TOCTOU race in Linux KVM SEV-SNP allows guest OS users to compromise the host through a guest-controlled PSC buffer. The snp_begin_psc() path validates guest-accessible indices and entries, then rereads mutable fields when calculating and processing page-state ranges. Code execution inside an SEV-SNP guest and concurrent PSC updates are required; successful exploitation crosses the VM boundary and can expose or corrupt memory and interrupt the host.

CVSS severity8.8
High
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

TOCTOU race in Linux KVM SEV-SNP allows guest OS users to compromise the host through a guest-controlled PSC buffer. The snp_begin_psc() path validates guest-accessible indices and entries, then rereads mutable fields when calculating and processing page-state ranges. Code execution inside an SEV-SNP guest and concurrent PSC updates are required; successful exploitation crosses the VM boundary and can expose or corrupt memory and interrupt the host.

The record

CVE
CVE-2026-63937
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1611
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=6.11
  2. Affected versionversion=9b54e248d2644be71cb394eb85f31ad99e023a05 <b1dfaa6f7a957726a6800135be3659fbe4bbf2a4
  3. Affected versionversion=9b54e248d2644be71cb394eb85f31ad99e023a05 <bd232801ef1d1fd985d2d4ca3cd1d888303ca86f
  4. Affected versionversion=9b54e248d2644be71cb394eb85f31ad99e023a05 <c8cc238093ca6c99267032f6cfe78f59389f3157
  5. Affected versionversion=9b54e248d2644be71cb394eb85f31ad99e023a05 <edbbe88f83b524434974e84808d3093199d67c24

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.11; version=9b54e248d2644be71cb394eb85f31ad99e023a05 <b1dfaa6f7a957726a6800135be3659fbe4bbf2a4; version=9b54e248d2644be71cb394eb85f31ad99e023a05 <bd232801ef1d1fd985d2d4ca3cd1d888303ca86f; version=9b54e248d2644be71cb394eb85f31ad99e023a05 <c8cc238093ca6c99267032f6cfe78f59389f3157; version=9b54e248d2644be71cb394eb85f31ad99e023a05 <edbbe88f83b524434974e84808d3093199d67c24

Published CVSS scores

8.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1611Escape to Host

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