CVE-2023-53023

Kernel memory corruption via repeated LLCP cleanup

Published Mar 27, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel NFC LLCP allows local users to corrupt kernel memory by closing sockets after NFC device removal. local_cleanup() frees rx_pending during device unregister but leaves the pointer intact, so final LLCP socket release frees the same sk_buff again. An attacker must hold LLCP sockets while a local NFC device is unregistered; the second free can crash the kernel or enable kernel-level code execution.

CVSS severity7.8
High
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

Use-after-free in Linux kernel NFC LLCP allows local users to corrupt kernel memory by closing sockets after NFC device removal. local_cleanup() frees rx_pending during device unregister but leaves the pointer intact, so final LLCP socket release frees the same sk_buff again. An attacker must hold LLCP sockets while a local NFC device is unregistered; the second free can crash the kernel or enable kernel-level code execution.

The record

CVE
CVE-2023-53023
Published
Mar 27, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record 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=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <4bb4db7f3187c6e3de6b229ffc87cdb30a2d22b6
  2. Affected versionversion=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <54f7be61584b8ec4c6df405f479495b9397bae4a
  3. Affected versionversion=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <7f129927feaf7c10b1c38bbce630172e9a08c834
  4. Affected versionversion=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <a59cdbda3714e11aa3ab579132864c4c8c6d54f9
  5. Affected versionversion=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <ad1baab3a5c03692d22ce446f38596a126377f6a
  6. Affected versionversion=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <b09ae26f08aaf2d85f96ea7f90ddd3387f62216f
  7. Affected versionversion=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <d3605282ec3502ec8847915eb2cf1f340493ff79
  8. Affected versionversion=3.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <4bb4db7f3187c6e3de6b229ffc87cdb30a2d22b6; version=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <54f7be61584b8ec4c6df405f479495b9397bae4a; version=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <7f129927feaf7c10b1c38bbce630172e9a08c834; version=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <a59cdbda3714e11aa3ab579132864c4c8c6d54f9; version=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <ad1baab3a5c03692d22ce446f38596a126377f6a; version=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <b09ae26f08aaf2d85f96ea7f90ddd3387f62216f; version=3536da06db0baa675f32de608c0a4c0f5ef0e9ff <d3605282ec3502ec8847915eb2cf1f340493ff79; version=3.9

Published CVSS scores

7.8Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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