CVE-2022-50647

Kernel crash via unmapped port I/O access

Published Dec 9, 2025 · Updated May 11, 2026

A RISC-V Linux kernel port I/O flaw allows local users with parallel-port access to crash the kernel by writing to a PCIe device. The insb, outsb, and related wrapper macros dereference a physical PCI port address instead of adding PCI_IOBASE to reach its memory mapping. Exploitation requires RISC-V hardware, an affected kernel, a PCIe parallel port, and permission to access the port; the resulting invalid access produces a kernel memory fault.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A RISC-V Linux kernel port I/O flaw allows local users with parallel-port access to crash the kernel by writing to a PCIe device. The insb, outsb, and related wrapper macros dereference a physical PCI port address instead of adding PCI_IOBASE to reach its memory mapping. Exploitation requires RISC-V hardware, an affected kernel, a PCIe parallel port, and permission to access the port; the resulting invalid access produces a kernel memory fault.

The record

CVE
CVE-2022-50647
Published
Dec 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 9, 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=4.15
  2. Affected versionversion=fab957c11efe2f405e08b9f0d080524bc2631428 <140b2b92dbefffa7f4f7211a1fd399a6e79e71c4
  3. Affected versionversion=fab957c11efe2f405e08b9f0d080524bc2631428 <1acee4616930fc07265cb8e539753a8062daa8e0
  4. Affected versionversion=fab957c11efe2f405e08b9f0d080524bc2631428 <2c60db6869fe5213471fcf4fe5704dc29da8b5ee
  5. Affected versionversion=fab957c11efe2f405e08b9f0d080524bc2631428 <2ce9fab94b8db61f014e43ddf80dd1524ae6dff4
  6. Affected versionversion=fab957c11efe2f405e08b9f0d080524bc2631428 <9cc205e3c17d5716da7ebb7fa0c985555e95d009
  7. Affected versionversion=fab957c11efe2f405e08b9f0d080524bc2631428 <dc235db7b79a352d07d62e8757ad856dbf1564c1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=fab957c11efe2f405e08b9f0d080524bc2631428 <140b2b92dbefffa7f4f7211a1fd399a6e79e71c4; version=fab957c11efe2f405e08b9f0d080524bc2631428 <1acee4616930fc07265cb8e539753a8062daa8e0; version=fab957c11efe2f405e08b9f0d080524bc2631428 <2c60db6869fe5213471fcf4fe5704dc29da8b5ee; version=fab957c11efe2f405e08b9f0d080524bc2631428 <2ce9fab94b8db61f014e43ddf80dd1524ae6dff4; version=fab957c11efe2f405e08b9f0d080524bc2631428 <9cc205e3c17d5716da7ebb7fa0c985555e95d009; version=fab957c11efe2f405e08b9f0d080524bc2631428 <dc235db7b79a352d07d62e8757ad856dbf1564c1

Published CVSS scores

No CVSS assessment is available in this record.

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

T1499.004Application or System Exploitation

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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