CVE-2022-50636

I/O hang via false PCI VF absence

Published Dec 9, 2025 · Updated May 11, 2026

Denial of service in the Linux kernel allows local users to hang in-progress virtio I/O during PCI virtual-function removal. pci_device_is_present() reads a virtual function's 0xffff vendor and device IDs as absence, causing virtio_pci_remove() to break the virtqueue and skip its completion callback. Triggering the hang requires administrative access to unbind the driver or disable SR-IOV virtual functions while I/O is active; the bounded impact is stalled I/O.

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

Denial of service in the Linux kernel allows local users to hang in-progress virtio I/O during PCI virtual-function removal. pci_device_is_present() reads a virtual function's 0xffff vendor and device IDs as absence, causing virtio_pci_remove() to break the virtqueue and skip its completion callback. Triggering the hang requires administrative access to unbind the driver or disable SR-IOV virtual functions while I/O is active; the bounded impact is stalled I/O.

The record

CVE
CVE-2022-50636
Published
Dec 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

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=3.13
  2. Affected versionversion=8496e85c20e7836b3dec97780e40f420a3ae2801 <518573988a2f14f517403db2ece5ddaefba21e94
  3. Affected versionversion=8496e85c20e7836b3dec97780e40f420a3ae2801 <643d77fda08d06f863af35e80a7e517ea61d9629
  4. Affected versionversion=8496e85c20e7836b3dec97780e40f420a3ae2801 <65bd0962992abd42e77a05e68c7b40e7c73726d1
  5. Affected versionversion=8496e85c20e7836b3dec97780e40f420a3ae2801 <67fd41bbb0f51aa648a47f728b99e6f1fa2ccc34
  6. Affected versionversion=8496e85c20e7836b3dec97780e40f420a3ae2801 <81565e51ccaf6fff8910e997ee22e16b5e1dabc3
  7. Affected versionversion=8496e85c20e7836b3dec97780e40f420a3ae2801 <98b04dd0b4577894520493d96bc4623387767445
  8. Affected versionversion=8496e85c20e7836b3dec97780e40f420a3ae2801 <99ef6cc791584495987dd11b14769b450dfa5820
  9. Affected versionversion=8496e85c20e7836b3dec97780e40f420a3ae2801 <f4b44c7766dae2b8681f621941cabe9f14066d59

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3.13; version=8496e85c20e7836b3dec97780e40f420a3ae2801 <518573988a2f14f517403db2ece5ddaefba21e94; version=8496e85c20e7836b3dec97780e40f420a3ae2801 <643d77fda08d06f863af35e80a7e517ea61d9629; version=8496e85c20e7836b3dec97780e40f420a3ae2801 <65bd0962992abd42e77a05e68c7b40e7c73726d1; version=8496e85c20e7836b3dec97780e40f420a3ae2801 <67fd41bbb0f51aa648a47f728b99e6f1fa2ccc34; version=8496e85c20e7836b3dec97780e40f420a3ae2801 <81565e51ccaf6fff8910e997ee22e16b5e1dabc3; version=8496e85c20e7836b3dec97780e40f420a3ae2801 <98b04dd0b4577894520493d96bc4623387767445; version=8496e85c20e7836b3dec97780e40f420a3ae2801 <99ef6cc791584495987dd11b14769b450dfa5820; version=8496e85c20e7836b3dec97780e40f420a3ae2801 <f4b44c7766dae2b8681f621941cabe9f14066d59

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.

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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
Privilegesadmin
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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