CVE-2023-0179Public exploit

Local root code execution via VLAN length underflow

Published Mar 27, 2023 · Updated Feb 19, 2025

Stack buffer overflow in Linux Kernel 5.5 through 6.2-rc3 allows local users to execute arbitrary code as root through nftables. nft_payload_copy_vlan subtracts a double-tagged VLAN length with the wrong sign, wrapping an 8-bit copy length and overwriting adjacent stack memory. Reachability requires Netfilter, nftables and 802.1Q VLAN support plus CAP_NET_ADMIN, which an unprivileged user namespace can provide.

CVSS severity7.8
High
EPSS probability1.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in Linux Kernel 5.5 through 6.2-rc3 allows local users to execute arbitrary code as root through nftables. nft_payload_copy_vlan subtracts a double-tagged VLAN length with the wrong sign, wrapping an 8-bit copy length and overwriting adjacent stack memory. Reachability requires Netfilter, nftables and 802.1Q VLAN support plus CAP_NET_ADMIN, which an unprivileged user namespace can provide.

The record

CVE
CVE-2023-0179
Published
Mar 27, 2023
Updated
Feb 19, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-190, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 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

7.8NIST NVDCVSS: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 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 exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1068Exploitation for Privilege Escalation

Public exploit references

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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