CVE-2022-50001

Local system crash via unrestricted TPROXY hook

Published Jun 18, 2025 · Updated May 11, 2026

A null-pointer dereference in the Linux kernel allows local users to crash the system by installing an nftables TPROXY rule. The nft_tproxy expression lacked hook validation restricting it to prerouting, so use from an output hook reaches a null pointer. Exploitation requires local low-privileged access and nftables TPROXY support; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A null-pointer dereference in the Linux kernel allows local users to crash the system by installing an nftables TPROXY rule. The nft_tproxy expression lacked hook validation restricting it to prerouting, so use from an output hook reaches a null pointer. Exploitation requires local low-privileged access and nftables TPROXY support; the bounded consequence is a kernel crash.

The record

CVE
CVE-2022-50001
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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?

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

  1. Affected versionversion=4.19
  2. Affected versionversion=4ed8eb6570a49931c705512060acd50058d61616 <0b21edf4cc13516716848e0a4fdf726aa2a62cd9
  3. Affected versionversion=4ed8eb6570a49931c705512060acd50058d61616 <18bbc3213383a82b05383827f4b1b882e3f0a5a5
  4. Affected versionversion=4ed8eb6570a49931c705512060acd50058d61616 <343fed6b0daeb528ae5c9d4d84d9ff763ac95619
  5. Affected versionversion=4ed8eb6570a49931c705512060acd50058d61616 <83ef55c4281f1b4c6bd4457c2e96ccd1c9e80200
  6. Affected versionversion=4ed8eb6570a49931c705512060acd50058d61616 <9a1d92cbeac3335fee99fa865b8c5b0f2e71a8f7
  7. Affected versionversion=4ed8eb6570a49931c705512060acd50058d61616 <eaba3f9b672c3a3f820da8ee9584b9520674eafa

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.19; version=4ed8eb6570a49931c705512060acd50058d61616 <0b21edf4cc13516716848e0a4fdf726aa2a62cd9; version=4ed8eb6570a49931c705512060acd50058d61616 <18bbc3213383a82b05383827f4b1b882e3f0a5a5; version=4ed8eb6570a49931c705512060acd50058d61616 <343fed6b0daeb528ae5c9d4d84d9ff763ac95619; version=4ed8eb6570a49931c705512060acd50058d61616 <83ef55c4281f1b4c6bd4457c2e96ccd1c9e80200; version=4ed8eb6570a49931c705512060acd50058d61616 <9a1d92cbeac3335fee99fa865b8c5b0f2e71a8f7; version=4ed8eb6570a49931c705512060acd50058d61616 <eaba3f9b672c3a3f820da8ee9584b9520674eafa

Published CVSS scores

5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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