CVE-2023-3863

Crash and memory disclosure via LLCP reference race

Published Jul 24, 2023 · Updated Feb 13, 2025

Use-after-free in Linux kernel NFC LLCP allows local users with special privileges to crash the system or disclose kernel memory. nfc_llcp_find_local returns an LLCP local object from the device list without taking a reference, allowing concurrent device unregistration to free it before callers dereference it. Reaching the race requires special local privileges and concurrent NFC device teardown; reported consequences are a system crash or kernel-memory disclosure.

CVSS severity4.1
Medium
EPSS probability0.23%
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 with special privileges to crash the system or disclose kernel memory. nfc_llcp_find_local returns an LLCP local object from the device list without taking a reference, allowing concurrent device unregistration to free it before callers dereference it. Reaching the race requires special local privileges and concurrent NFC device teardown; reported consequences are a system crash or kernel-memory disclosure.

The record

CVE
CVE-2023-3863
Published
Jul 24, 2023
Updated
Feb 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1499, T1005
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.1NVDCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
6.4Red HatCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service
T1005Data from Local System

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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