CVE-2022-50521

Local service interruption via unreleased ACPI buffers

Published Oct 7, 2025 · Updated Oct 7, 2025

Memory leak in the mxm-wmi driver in Linux before 6.2 allows local users to interrupt service through repeated WMI method calls. The mxm_wmi_call_mxds() and mxm_wmi_call_mxmx() paths ask wmi_evaluate_method() to allocate an ACPI output buffer but never free the unused result. Exploitation requires local low-privileged access and applicable MXM WMI hardware; repeated calls consume kernel memory until availability is lost.

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

Memory leak in the mxm-wmi driver in Linux before 6.2 allows local users to interrupt service through repeated WMI method calls. The mxm_wmi_call_mxds() and mxm_wmi_call_mxmx() paths ask wmi_evaluate_method() to allocate an ACPI output buffer but never free the unused result. Exploitation requires local low-privileged access and applicable MXM WMI hardware; repeated calls consume kernel memory until availability is lost.

The record

CVE
CVE-2022-50521
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 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=3.0
  2. Affected versionversion=99b38b4acc0d7dbbab443273577cff60080fcfad <14bb4bde3b7b2584734b13747b345caeeb41bea3
  3. Affected versionversion=99b38b4acc0d7dbbab443273577cff60080fcfad <17cd8c46cbec4e6ad593fb9159928b8e7608c11a
  4. Affected versionversion=99b38b4acc0d7dbbab443273577cff60080fcfad <379e7794c5e7485193d25d73614fbbd1e1387f6f
  5. Affected versionversion=99b38b4acc0d7dbbab443273577cff60080fcfad <3cf81501356c9e898ad94b2369ffc805f83f7d7b
  6. Affected versionversion=99b38b4acc0d7dbbab443273577cff60080fcfad <50ac517d6f5348b276f1f663799cf85dce521518
  7. Affected versionversion=99b38b4acc0d7dbbab443273577cff60080fcfad <5b0f81b0808235967868e01336c976e840217108
  8. Affected versionversion=99b38b4acc0d7dbbab443273577cff60080fcfad <727cc0147f5066e359aca65cc6cc5e6d64cc15d8
  9. Affected versionversion=99b38b4acc0d7dbbab443273577cff60080fcfad <87426ce3bd57ad414b6e2436434ef8128986a9a5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.0; version=99b38b4acc0d7dbbab443273577cff60080fcfad <14bb4bde3b7b2584734b13747b345caeeb41bea3; version=99b38b4acc0d7dbbab443273577cff60080fcfad <17cd8c46cbec4e6ad593fb9159928b8e7608c11a; version=99b38b4acc0d7dbbab443273577cff60080fcfad <379e7794c5e7485193d25d73614fbbd1e1387f6f; version=99b38b4acc0d7dbbab443273577cff60080fcfad <3cf81501356c9e898ad94b2369ffc805f83f7d7b; version=99b38b4acc0d7dbbab443273577cff60080fcfad <50ac517d6f5348b276f1f663799cf85dce521518; version=99b38b4acc0d7dbbab443273577cff60080fcfad <5b0f81b0808235967868e01336c976e840217108; version=99b38b4acc0d7dbbab443273577cff60080fcfad <727cc0147f5066e359aca65cc6cc5e6d64cc15d8; version=99b38b4acc0d7dbbab443273577cff60080fcfad <87426ce3bd57ad414b6e2436434ef8128986a9a5

Published CVSS scores

5.5NIST NVDCVSS: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

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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

CWE-401Missing Release of Memory after Effective Lifetime
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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