CVE-2023-54172

Guest panic via ENDBR-less indirect hypercalls

Published Dec 30, 2025 · Updated Dec 30, 2025

Denial of service in Linux x86 Hyper-V guests allows local users to trigger a kernel panic through an indirect hypercall. The x86 Hyper-V path indirectly calls a hypercall page without first verifying that its first instruction is ENDBR64, so IBT raises an exception. The condition requires an x86-64 Hyper-V VM at ConfigVersion 9.3 or later on IBT-capable hardware with guest IBT enabled; the exception panics the guest.

CVSS severity5.5
Medium
EPSS probability0.19%
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 x86 Hyper-V guests allows local users to trigger a kernel panic through an indirect hypercall. The x86 Hyper-V path indirectly calls a hypercall page without first verifying that its first instruction is ENDBR64, so IBT raises an exception. The condition requires an x86-64 Hyper-V VM at ConfigVersion 9.3 or later on IBT-capable hardware with guest IBT enabled; the exception panics the guest.

The record

CVE
CVE-2023-54172
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <73626b70b361ddda7c380e52c236aa4f2487c402
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <98cccbd0a19a161971bc7f7feb10577adc62c400
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d5ace2a776442d80674eff9ed42e737f7dd95056

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <73626b70b361ddda7c380e52c236aa4f2487c402; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <98cccbd0a19a161971bc7f7feb10577adc62c400; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d5ace2a776442d80674eff9ed42e737f7dd95056

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/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

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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