CVE-2023-0461Known exploitationPublic exploit

Local privilege escalation via inherited TLS context

Published Feb 28, 2023 · Updated Feb 13, 2025

Use-after-free in the Linux kernel ULP subsystem allows local users to elevate privileges through reused TCP listener sockets. inet_csk_listen_start leaves icsk_ulp_data referencing a TLS context when a connected socket becomes a listener, so accepted sockets inherit stale state. Exploitation requires CONFIG_TLS or CONFIG_XFRM_ESPINTCP; successful memory corruption grants kernel-level code execution, while failure can crash the system.

CVSS severity7.8
High
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in the Linux kernel ULP subsystem allows local users to elevate privileges through reused TCP listener sockets. inet_csk_listen_start leaves icsk_ulp_data referencing a TLS context when a connected socket becomes a listener, so accepted sockets inherit stale state. Exploitation requires CONFIG_TLS or CONFIG_XFRM_ESPINTCP; successful memory corruption grants kernel-level code execution, while failure can crash the system.

The record

CVE
CVE-2023-0461
Published
Feb 28, 2023
Updated
Feb 13, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 28, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2c02d41d71f90a5168391b6a5f2954112ba2307c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0 <2c02d41d71f90a5168391b6a5f2954112ba2307c

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Oracle LinuxCVSS:3.0/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo