CVE-2022-49549

Service interruption via threshold-bank allocation leak

Published Feb 26, 2025 · Updated May 11, 2026

Memory leak in AMD x86 MCE threshold-bank setup in Linux allows local users to interrupt service by exhausting kernel memory. When threshold_create_bank fails, mce_threshold_remove_device reads the threshold_banks per-CPU pointer before bp is stored there, leaving the allocated bank array unfreed. Reachability requires local low-privileged access and a bank-creation failure; the published impact is limited to availability.

CVSS severity5.5
Medium
EPSS probability0.26%
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 AMD x86 MCE threshold-bank setup in Linux allows local users to interrupt service by exhausting kernel memory. When threshold_create_bank fails, mce_threshold_remove_device reads the threshold_banks per-CPU pointer before bp is stored there, leaving the allocated bank array unfreed. Reachability requires local low-privileged access and a bank-creation failure; the published impact is limited to availability.

The record

CVE
CVE-2022-49549
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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=5.8
  2. Affected versionversion=6458de97fc15530b54477c4e2b70af653e8ac3d9 <396b8e7ab2a99ddac57d3522b3da5e58cb608d37
  3. Affected versionversion=6458de97fc15530b54477c4e2b70af653e8ac3d9 <9708f1956eeb70c86943e0bc62fa3b0101b59616
  4. Affected versionversion=6458de97fc15530b54477c4e2b70af653e8ac3d9 <b4acb8e7f1594607bc9017ef0aacb40b24a003d6
  5. Affected versionversion=6458de97fc15530b54477c4e2b70af653e8ac3d9 <cc0dd4456f9573bf8af9b4d8754433918e809e1e
  6. Affected versionversion=6458de97fc15530b54477c4e2b70af653e8ac3d9 <e5f28623ceb103e13fc3d7bd45edf9818b227fd0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=6458de97fc15530b54477c4e2b70af653e8ac3d9 <396b8e7ab2a99ddac57d3522b3da5e58cb608d37; version=6458de97fc15530b54477c4e2b70af653e8ac3d9 <9708f1956eeb70c86943e0bc62fa3b0101b59616; version=6458de97fc15530b54477c4e2b70af653e8ac3d9 <b4acb8e7f1594607bc9017ef0aacb40b24a003d6; version=6458de97fc15530b54477c4e2b70af653e8ac3d9 <cc0dd4456f9573bf8af9b4d8754433918e809e1e; version=6458de97fc15530b54477c4e2b70af653e8ac3d9 <e5f28623ceb103e13fc3d7bd45edf9818b227fd0

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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

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 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.

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Technologies

Your stack

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Your stack

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