CVE-2023-54066

Kernel crash via zero-length I2C message

Published Dec 24, 2025 · Updated Dec 24, 2025

NULL pointer dereference in the Linux gl861 DVB USB driver allows local users to crash the kernel through a malformed I2C message. The gl861_i2c_master_xfer function accepts a zero-length message with a NULL buffer because its checks fail to reject msg[i].len equal to zero, then dereferences msg[i].buf[0]. Exploitation requires low-privileged local access capable of routing the crafted message through the GL861 driver, and the bounded consequence is a host-kernel crash.

CVSS severity5.5
Medium
EPSS probability0.19%
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 gl861 DVB USB driver allows local users to crash the kernel through a malformed I2C message. The gl861_i2c_master_xfer function accepts a zero-length message with a NULL buffer because its checks fail to reject msg[i].len equal to zero, then dereferences msg[i].buf[0]. Exploitation requires low-privileged local access capable of routing the crafted message through the GL861 driver, and the bounded consequence is a host-kernel crash.

The record

CVE
CVE-2023-54066
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 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 <2a33fc57133d6f39d62285df6706aeb1714967f1
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <578b67614ae0e4fba3945b66a4c8f9ae77115bcb
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <72af676551efe820e309a6c7681c2c4372f37376
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b97719a66970601cd3151a3e2020f4454a1c4ff6
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dfcd3c010209927b9f45b860f046635dc32e32e1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2a33fc57133d6f39d62285df6706aeb1714967f1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <578b67614ae0e4fba3945b66a4c8f9ae77115bcb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <72af676551efe820e309a6c7681c2c4372f37376; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b97719a66970601cd3151a3e2020f4454a1c4ff6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dfcd3c010209927b9f45b860f046635dc32e32e1

Published CVSS scores

5.5SUSECVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

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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