CVE-2024-22374

Guest shutdown via premature SEAMCALL VMEXIT

Published Aug 14, 2024 · Updated Aug 14, 2024

Insufficient control flow management in 4th- and 5th-generation Intel Xeon Scalable Processors allows local users to shut down a guest. The SEAMCALL instruction raises a VMEXIT before checking the caller's privilege level and cannot be disabled on TDX-capable CPUs. A user-mode process in a legacy guest can trigger the flaw when a non-TDX-aware hypervisor runs on TDX hardware, terminating that guest and its workloads rather than the host.

CVSS severity6.8
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient control flow management in 4th- and 5th-generation Intel Xeon Scalable Processors allows local users to shut down a guest. The SEAMCALL instruction raises a VMEXIT before checking the caller's privilege level and cannot be disabled on TDX-capable CPUs. A user-mode process in a legacy guest can trigger the flaw when a non-TDX-aware hypervisor runs on TDX hardware, terminating that guest and its workloads rather than the host.

The record

CVE
CVE-2024-22374
Published
Aug 14, 2024
Updated
Aug 14, 2024
Vendor
Topcon Positioning Systems, Inc.
Product
Intel Xeon Scalable Processors
Classifications
CWE-691, T1529
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=See references

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Topcon Positioning Systems, Inc. · Intel Xeon Scalable Processorsversion=See references

Published CVSS scores

6.8Intel CorporationCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5Intel CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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

CWE-691Insufficient Control Flow Management
T1529System Shutdown/Reboot

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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