CVE-2023-42467Public exploit

Host process crash via undersized SCSI block size

Published Sep 11, 2023 · Updated Sep 26, 2024

Division by zero in QEMU 8.0.0 and earlier allows guest OS users to crash the QEMU process and stop the guest via SCSI commands. scsi_disk_emulate_mode_select accepts a 256-byte block size, so scsi_disk_reset later divides by a zero sector ratio. A privileged guest OS user must issue crafted commands to the emulated am53c974 SCSI device; the arithmetic exception terminates that VM's QEMU process and immediately stops the guest.

CVSS severity5.5
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Division by zero in QEMU 8.0.0 and earlier allows guest OS users to crash the QEMU process and stop the guest via SCSI commands. scsi_disk_emulate_mode_select accepts a 256-byte block size, so scsi_disk_reset later divides by a zero sector ratio. A privileged guest OS user must issue crafted commands to the emulated am53c974 SCSI device; the arithmetic exception terminates that VM's QEMU process and immediately stops the guest.

The record

CVE
CVE-2023-42467
Published
Sep 11, 2023
Updated
Sep 26, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-369, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
2.3Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L

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 exploitPublished

Weakness, pattern, technique

CWE-369Divide By Zero
T1499.004Application or System Exploitation

Public exploit references

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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