CVE-2023-1075

Kernel-state byte disclosure via empty-list confusion

Published Mar 27, 2023 · Updated Feb 24, 2025

Type confusion in the Linux Kernel net/tls stack allows local users to disclose one kernel-state byte through a TLS socket. The tls_is_tx_ready() path calls list_first_entry() on an empty tx_list, treats the list head as a TLS record, and reads the byte overlapping rec->tx_ready. Exploitation requires local low-privilege access and reaches only that byte; no integrity or availability impact is reported.

CVSS severity3.3
Low
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in the Linux Kernel net/tls stack allows local users to disclose one kernel-state byte through a TLS socket. The tls_is_tx_ready() path calls list_first_entry() on an empty tx_list, treats the list head as a TLS record, and reads the byte overlapping rec->tx_ready. Exploitation requires local low-privilege access and reaches only that byte; no integrity or availability impact is reported.

The record

CVE
CVE-2023-1075
Published
Mar 27, 2023
Updated
Feb 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-843, CWE-200
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 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?

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  1. Affected versionversion=unknown

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=unknown

Published CVSS scores

3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.3CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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-843Access of Resource Using Incompatible Type ('Type Confusion')
CWE-200Exposure of Sensitive Information to an Unauthorized Actor

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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