CVE-2023-28328

System crash via unchecked zero-length I2C message

Published Apr 19, 2023 · Updated Mar 19, 2025

A NULL pointer dereference in the Linux kernel AZ6027 DVB USB driver before 6.2 allows local users to crash the system via a malformed I2C message. In az6027_i2c_xfer(), an address 0x99 message with zero length leaves msg[i].buf null, yet the driver reads msg[i].buf[0] before sending the USB request. A low-privilege user must reach the driver's I2C ioctl path, and successful exploitation causes a system crash rather than data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in the Linux kernel AZ6027 DVB USB driver before 6.2 allows local users to crash the system via a malformed I2C message. In az6027_i2c_xfer(), an address 0x99 message with zero length leaves msg[i].buf null, yet the driver reads msg[i].buf[0] before sending the USB request. A low-privilege user must reach the driver's I2C ioctl path, and successful exploitation causes a system crash rather than data disclosure or modification.

The record

CVE
CVE-2023-28328
Published
Apr 19, 2023
Updated
Mar 19, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 2025Record 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=Linux Kernel prior to kernel 6.2 RC1 <6.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux Kernel prior to kernel 6.2 RC1 <6.2

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Oracle LinuxCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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