CVE-2023-40283

Local privilege escalation via dangling L2CAP children

Published Aug 14, 2023 · Updated Feb 25, 2026

Use-after-free in the Linux kernel before 6.4.10 allows local users to escalate privileges by racing L2CAP socket release. The l2cap_sock_release function frees a parent socket while its live child sockets retain pointers to that freed object, which l2cap_sock_ready_cb later reads. A local unprivileged account with access to the Bluetooth L2CAP socket path is required; exploitation can crash the kernel or gain kernel privileges.

CVSS severity7.8
High
EPSS probability0.55%
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 the Linux kernel before 6.4.10 allows local users to escalate privileges by racing L2CAP socket release. The l2cap_sock_release function frees a parent socket while its live child sockets retain pointers to that freed object, which l2cap_sock_ready_cb later reads. A local unprivileged account with access to the Bluetooth L2CAP socket path is required; exploitation can crash the kernel or gain kernel privileges.

The record

CVE
CVE-2023-40283
Published
Aug 14, 2023
Updated
Feb 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS: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

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
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.

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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