CVE-2019-12067

Guest-triggered process crash via unchecked command pointer

Published Jun 2, 2021 · Updated Aug 4, 2024

NULL pointer dereference in QEMU's AHCI emulation allows privileged guest OS users to crash the associated QEMU process. During DMA buffer commit, ahci_commit_buf dereferences ad->cur_cmd to read and update its status field without first verifying that the command header pointer is non-NULL. The flaw requires AHCI emulation and privileged access inside a guest, and its effect is limited to terminating that guest's QEMU process.

CVSS severity6.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in QEMU's AHCI emulation allows privileged guest OS users to crash the associated QEMU process. During DMA buffer commit, ahci_commit_buf dereferences ad->cur_cmd to read and update its status field without first verifying that the command header pointer is non-NULL. The flaw requires AHCI emulation and privileged access inside a guest, and its effect is limited to terminating that guest's QEMU process.

The record

CVE
CVE-2019-12067
Published
Jun 2, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:P

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application 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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