CVE-2026-64308

Host crash via unintended SNP initialization

Published Jul 25, 2026 · Updated Jul 25, 2026

Denial of service in Linux Kernel 6.12.75 through 6.12.95 and 6.16 allows local users to crash AMD SEV hosts via /dev/sev ioctls. The sev_ioctl_do_snp_vlek_load function initializes and shuts down SNP when SNP was not initialized, and a failed initialization can clear MSR_VM_HSAVE_PA before the next VMRUN. Reachability requires local /dev/sev access while KVM runs guests on an AMD SEV host; the bounded consequence is a host crash that interrupts those guests.

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 6.12.95 and 6.16 allows local users to crash AMD SEV hosts via /dev/sev ioctls. The sev_ioctl_do_snp_vlek_load function initializes and shuts down SNP when SNP was not initialized, and a failed initialization can clear MSR_VM_HSAVE_PA before the next VMRUN. Reachability requires local /dev/sev access while KVM runs guests on an AMD SEV host; the bounded consequence is a host crash that interrupts those guests.

The record

CVE
CVE-2026-64308
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
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 <61cf5eef20657bff9ca235fe938a99ce5ff65c06
  2. Affected versionversion=6.12.75 <6.12.96
  3. Affected versionversion=6.16
  4. Affected versionversion=ceac7fb89e8da465aec3ac3c20477f912f5c3a6c <8836801847b9479ac046cb18a24981e1b0b05e9d
  5. Affected versionversion=ceac7fb89e8da465aec3ac3c20477f912f5c3a6c <92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4
  6. Affected versionversion=ceac7fb89e8da465aec3ac3c20477f912f5c3a6c <f91e9dbb5845d1e5abf1028e6df57dcf61583e1b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 <61cf5eef20657bff9ca235fe938a99ce5ff65c06; version=6.12.75 <6.12.96; version=6.16; version=ceac7fb89e8da465aec3ac3c20477f912f5c3a6c <8836801847b9479ac046cb18a24981e1b0b05e9d; version=ceac7fb89e8da465aec3ac3c20477f912f5c3a6c <92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4; version=ceac7fb89e8da465aec3ac3c20477f912f5c3a6c <f91e9dbb5845d1e5abf1028e6df57dcf61583e1b

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 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

T1499Endpoint Denial of Service

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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