CVE-2022-50471

Domain crash via stale split-VMA tracking

Published Oct 4, 2025 · Updated Oct 4, 2025

Denial of service in the Linux kernel xen/gntdev driver allows local users to crash a Xen PV domain via split grant unmapping. The driver retains one VMA reference for a mapping that can span multiple split VMAs and removes its MMU notifier before the final VMA closes, causing invalid page unmaps. The path requires local access to xen/gntdev in a PV domain, and the reported general protection fault occurs when Xen is built with CONFIG_DEBUG.

CVSS severity5.5
Medium
EPSS probability0.16%
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 xen/gntdev driver allows local users to crash a Xen PV domain via split grant unmapping. The driver retains one VMA reference for a mapping that can span multiple split VMAs and removes its MMU notifier before the final VMA closes, causing invalid page unmaps. The path requires local access to xen/gntdev in a PV domain, and the reported general protection fault occurs when Xen is built with CONFIG_DEBUG.

The record

CVE
CVE-2022-50471
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 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=2.6.38
  2. Affected versionversion=ab31523c2fcac557226bac72cbdf5fafe01f9a26 <3c6a888e352283a14f37b9b433cd598a1a3a7dd0
  3. Affected versionversion=ab31523c2fcac557226bac72cbdf5fafe01f9a26 <4fb4053d90caa9985b87ec0e0c32c66a55bdfa3a
  4. Affected versionversion=ab31523c2fcac557226bac72cbdf5fafe01f9a26 <5c13a4a0291b30191eff9ead8d010e1ca43a4d0c
  5. Affected versionversion=ab31523c2fcac557226bac72cbdf5fafe01f9a26 <7c16d0a4e6a436b4e7c92bead3fab55aaa4c1141
  6. Affected versionversion=ab31523c2fcac557226bac72cbdf5fafe01f9a26 <cdafa219ace013c594e2491158ad1b51f9923dde

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.38; version=ab31523c2fcac557226bac72cbdf5fafe01f9a26 <3c6a888e352283a14f37b9b433cd598a1a3a7dd0; version=ab31523c2fcac557226bac72cbdf5fafe01f9a26 <4fb4053d90caa9985b87ec0e0c32c66a55bdfa3a; version=ab31523c2fcac557226bac72cbdf5fafe01f9a26 <5c13a4a0291b30191eff9ead8d010e1ca43a4d0c; version=ab31523c2fcac557226bac72cbdf5fafe01f9a26 <7c16d0a4e6a436b4e7c92bead3fab55aaa4c1141; version=ab31523c2fcac557226bac72cbdf5fafe01f9a26 <cdafa219ace013c594e2491158ad1b51f9923dde

Published CVSS scores

5.5NVDCVSS: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 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

T1499Endpoint Denial of Service

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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