CVE-2022-50851

Host crash via oversized guest IOTLB unmap

Published Dec 30, 2025 · Updated Dec 30, 2025

Denial of service in the Linux kernel vhost-vDPA subsystem allows guest OS users to crash the host via an oversized IOTLB unmap request. vhost_vdpa_unmap passes the guest-supplied start and size to iommu_unmap even when the range extends beyond mappings recorded in the vhost IOTLB. The path requires a vhost-vDPA guest using a virtual IOMMU; the resulting kernel BUG interrupts the host and its guests.

CVSS severity5.5
Medium
EPSS probability0.23%
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 vhost-vDPA subsystem allows guest OS users to crash the host via an oversized IOTLB unmap request. vhost_vdpa_unmap passes the guest-supplied start and size to iommu_unmap even when the range extends beyond mappings recorded in the vhost IOTLB. The path requires a vhost-vDPA guest using a virtual IOMMU; the resulting kernel BUG interrupts the host and its guests.

The record

CVE
CVE-2022-50851
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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=4c8cf31885f69e86be0b5b9e6677a26797365e1d <26b7400c89b81e2f6de4f224ba1fdf06f293de31
  2. Affected versionversion=4c8cf31885f69e86be0b5b9e6677a26797365e1d <8b258a31c2e8d4d4e42be70a7c6ca35a5afbff0d
  3. Affected versionversion=4c8cf31885f69e86be0b5b9e6677a26797365e1d <e794070af224ade46db368271896b2685ff4f96b
  4. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4c8cf31885f69e86be0b5b9e6677a26797365e1d <26b7400c89b81e2f6de4f224ba1fdf06f293de31; version=4c8cf31885f69e86be0b5b9e6677a26797365e1d <8b258a31c2e8d4d4e42be70a7c6ca35a5afbff0d; version=4c8cf31885f69e86be0b5b9e6677a26797365e1d <e794070af224ade46db368271896b2685ff4f96b; version=5.7

Published CVSS scores

5.5SUSECVSS: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.

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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

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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