CVE-2024-36913

Guest-memory disclosure via freed decrypted VMBus pages

Published May 30, 2024 · Updated Aug 5, 2026

Information disclosure in Linux VMBus allows attackers to read confidential-computing guest memory through shared pages. The VMBus error path returns a page to the allocator after set_memory_encrypted() or set_memory_decrypted() fails, leaving it shared with the host. Exploitation requires control of the guest's Hyper-V host or VMM; reusing the still-decrypted page can expose later guest data placed in that page.

CVSS severity9.3
Critical
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux VMBus allows attackers to read confidential-computing guest memory through shared pages. The VMBus error path returns a page to the allocator after set_memory_encrypted() or set_memory_decrypted() fails, leaving it shared with the host. Exploitation requires control of the guest's Hyper-V host or VMM; reusing the still-decrypted page can expose later guest data placed in that page.

The record

CVE
CVE-2024-36913
Published
May 30, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-1258, T1005
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 30, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.16
  2. Affected versionversion=f2f136c05fb6093818a3b3fefcba46231ac66a62 <03f5a999adba062456c8c818a683beb1b498983a
  3. Affected versionversion=f2f136c05fb6093818a3b3fefcba46231ac66a62 <6123a4e8e25bd40cf44db14694abac00e6b664e6
  4. Affected versionversion=f2f136c05fb6093818a3b3fefcba46231ac66a62 <7f2afcbfe4f6b6047b5f68db5067b7321e5be125
  5. Affected versionversion=f2f136c05fb6093818a3b3fefcba46231ac66a62 <e813a0fc2e597146e9cebea61ced9c796d4e308f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.16; version=f2f136c05fb6093818a3b3fefcba46231ac66a62 <03f5a999adba062456c8c818a683beb1b498983a; version=f2f136c05fb6093818a3b3fefcba46231ac66a62 <6123a4e8e25bd40cf44db14694abac00e6b664e6; version=f2f136c05fb6093818a3b3fefcba46231ac66a62 <7f2afcbfe4f6b6047b5f68db5067b7321e5be125; version=f2f136c05fb6093818a3b3fefcba46231ac66a62 <e813a0fc2e597146e9cebea61ced9c796d4e308f
The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f4 <03f5a999adba; version=1da177e4c3f4 <6123a4e8e25b; version=1da177e4c3f4 <e813a0fc2e59

Published CVSS scores

9.3Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
8.1CISACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1258Exposure of Sensitive System Information Due to Uncleared Debug Information
T1005Data from Local System

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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