CVE-2023-35001

Kernel privilege escalation via mis-scaled union indexing

Published Jul 5, 2023 · Updated Feb 13, 2025

Out-of-bounds access in affected Linux Kernel releases allows local users to gain kernel privileges via nft_byteorder expressions. The nft_byteorder_eval function indexes 16-bit members of a 32-bit-aligned union, causing size-2 conversions to access beyond stack arrays. Exploitation requires CAP_NET_ADMIN in a user or network namespace and permits kernel-memory disclosure or corruption, a system crash, or kernel-code execution.

CVSS severity7.8
High
EPSS probability1.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in affected Linux Kernel releases allows local users to gain kernel privileges via nft_byteorder expressions. The nft_byteorder_eval function indexes 16-bit members of a 32-bit-aligned union, causing size-2 conversions to access beyond stack arrays. Exploitation requires CAP_NET_ADMIN in a user or network namespace and permits kernel-memory disclosure or corruption, a system crash, or kernel-code execution.

The record

CVE
CVE-2023-35001
Published
Jul 5, 2023
Updated
Feb 13, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 5, 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?

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

  1. Affected versionversion=v3.13-rc1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=v3.13-rc1

Published CVSS scores

7.8Canonical Ltd.CVSS: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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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