CVE-2021-36148

Memory corruption via unchecked IRTE index

Published Jul 2, 2021 · Updated Aug 4, 2024

Buffer overflow in ACRN Hypervisor 2.4 and earlier allows local users to corrupt hypervisor memory via a malicious interrupt-remapping index. dmar_free_irte accepted index values at or above CONFIG_MAX_IR_ENTRIES and used them to address the interrupt-remapping table and irte_alloc_bitmap. Exploitation requires local interaction with a path that supplies the index; published sources do not establish code execution or a specific service interruption.

CVSS severity7.8
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in ACRN Hypervisor 2.4 and earlier allows local users to corrupt hypervisor memory via a malicious interrupt-remapping index. dmar_free_irte accepted index values at or above CONFIG_MAX_IR_ENTRIES and used them to address the interrupt-remapping table and irte_alloc_bitmap. Exploitation requires local interaction with a path that supplies the index; published sources do not establish code execution or a specific service interruption.

The record

CVE
CVE-2021-36148
Published
Jul 2, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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