CVE-2023-53220

Kernel crash via zero-length null-buffer message

Published Sep 15, 2025 · Updated Sep 15, 2025

NULL pointer dereference in the Linux kernel allows local users to crash the system through a malformed I2C message. The az6007_i2c_xfer function lets a user-controlled message with a null buffer and zero length pass its buffer checks, then reads msg[i].buf[0]. Local low-privileged access and an attached device using the az6007 media driver are required; successful triggering causes a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.16%
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 the Linux kernel allows local users to crash the system through a malformed I2C message. The az6007_i2c_xfer function lets a user-controlled message with a null buffer and zero length pass its buffer checks, then reads msg[i].buf[0]. Local low-privileged access and an attached device using the az6007 media driver are required; successful triggering causes a kernel crash.

The record

CVE
CVE-2023-53220
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1047f9343011f2cedc73c64829686206a7e9fc3f
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5b1ea100ad3695025969dc4693f307877fb688d6
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6ab7ea4e17d6a605d05308adf8f3408924770cba
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <991c77fe18c6f374bbf83376f8c42550aa565662
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a1110f19d4940e4185251d072cbb0ff51486a1e7
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a9def3e9718a4dc756f48db147d42ec41a966240
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <adcb73f8ce9aec48b1f85223f401c1574015d8d2
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c6763fefa267f6e62595a6ac1f57815d99fc90b7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1047f9343011f2cedc73c64829686206a7e9fc3f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5b1ea100ad3695025969dc4693f307877fb688d6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6ab7ea4e17d6a605d05308adf8f3408924770cba; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <991c77fe18c6f374bbf83376f8c42550aa565662; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a1110f19d4940e4185251d072cbb0ff51486a1e7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a9def3e9718a4dc756f48db147d42ec41a966240; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <adcb73f8ce9aec48b1f85223f401c1574015d8d2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c6763fefa267f6e62595a6ac1f57815d99fc90b7

Published CVSS scores

5.5CISA-ADPCVSS:3.1/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
T1499.004Application or System Exploitation

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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