CVE-2024-36912

Guest memory exposure via untracked decryption status

Published May 30, 2024 · Updated Aug 5, 2026

Linux allows adjacent attackers controlling an untrusted Hyper-V host to expose confidential-VM guest memory through VMBus operations. VMBus GPADL establish and teardown callers returned pages to the allocator after failed encryption-state changes without tracking that the buffers remained shared. The issue requires a CoCo guest and a host-induced conversion failure; reuse of those pages can expose guest data or cause corruption and a crash.

CVSS severity9.6
Critical
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Linux allows adjacent attackers controlling an untrusted Hyper-V host to expose confidential-VM guest memory through VMBus operations. VMBus GPADL establish and teardown callers returned pages to the allocator after failed encryption-state changes without tracking that the buffers remained shared. The issue requires a CoCo guest and a host-induced conversion failure; reuse of those pages can expose guest data or cause corruption and a crash.

The record

CVE
CVE-2024-36912
Published
May 30, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-1258
Attack vector
adjacent
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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=d4dccf353db80e209f262e3973c834e6e48ba9a9 <1999644d95194d4a58d3e80ad04ce19220a01a81
  3. Affected versionversion=d4dccf353db80e209f262e3973c834e6e48ba9a9 <211f514ebf1ef5de37b1cf6df9d28a56cfd242ca
  4. Affected versionversion=d4dccf353db80e209f262e3973c834e6e48ba9a9 <8e62341f5c45b27519b7d193bcc32ada416ad9d8
  5. Affected versionversion=d4dccf353db80e209f262e3973c834e6e48ba9a9 <bfae56be077ba14311509e70706a13458f87ea99

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.16; version=d4dccf353db80e209f262e3973c834e6e48ba9a9 <1999644d95194d4a58d3e80ad04ce19220a01a81; version=d4dccf353db80e209f262e3973c834e6e48ba9a9 <211f514ebf1ef5de37b1cf6df9d28a56cfd242ca; version=d4dccf353db80e209f262e3973c834e6e48ba9a9 <8e62341f5c45b27519b7d193bcc32ada416ad9d8; version=d4dccf353db80e209f262e3973c834e6e48ba9a9 <bfae56be077ba14311509e70706a13458f87ea99

Published CVSS scores

8.1CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.6Linux CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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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