CVE-2026-64307

Host crash via repeated SNP initialization

Published Jul 25, 2026 · Updated Jul 25, 2026

Denial of service in Linux Kernel 6.12.75 through 6.12.96 and 6.16 allows local users to crash AMD SEV hosts via /dev/sev ioctls. After SEV initialization has failed, SNP_CONFIG can retry SNP initialization and clear MSR_VM_HSAVE_PA while KVM is running active virtual machines. The next VMRUN raises a general-protection fault and crashes the host; reaching the path requires access to /dev/sev and the failed-initialization state.

CVSS severity4.7
Medium
EPSS probability0.17%
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 6.12.75 through 6.12.96 and 6.16 allows local users to crash AMD SEV hosts via /dev/sev ioctls. After SEV initialization has failed, SNP_CONFIG can retry SNP initialization and clear MSR_VM_HSAVE_PA while KVM is running active virtual machines. The next VMRUN raises a general-protection fault and crashes the host; reaching the path requires access to /dev/sev and the failed-initialization state.

The record

CVE
CVE-2026-64307
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 <345a6e869b33687e9268044bcaeeefd7c61da675
  2. Affected versionversion=6.12.75 <6.12.97
  3. Affected versionversion=6.16
  4. Affected versionversion=ceac7fb89e8da465aec3ac3c20477f912f5c3a6c <08f0e65e784c4b20e6e620dd4f68d8636073a3d2
  5. Affected versionversion=ceac7fb89e8da465aec3ac3c20477f912f5c3a6c <20f548cdac94860a164e5ebba4f7e4a01051cb06
  6. Affected versionversion=ceac7fb89e8da465aec3ac3c20477f912f5c3a6c <441ea32cf2755a0dc593557056b00b7caa0651f5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 <345a6e869b33687e9268044bcaeeefd7c61da675; version=6.12.75 <6.12.97; version=6.16; version=ceac7fb89e8da465aec3ac3c20477f912f5c3a6c <08f0e65e784c4b20e6e620dd4f68d8636073a3d2; version=ceac7fb89e8da465aec3ac3c20477f912f5c3a6c <20f548cdac94860a164e5ebba4f7e4a01051cb06; version=ceac7fb89e8da465aec3ac3c20477f912f5c3a6c <441ea32cf2755a0dc593557056b00b7caa0651f5

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/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.

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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

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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