CVE-2022-49883

Host memory disclosure and interruption via SMRAM overrun

Published May 1, 2025 · Updated Aug 5, 2026

Out-of-bounds access in Linux KVM 6.0 through 6.0.7 allows guest OS users to read host memory or interrupt the host. On a 64-bit host, KVM's SMM emulator walks 16 general-purpose registers through a 32-bit SMRAM image when guest long mode is absent, crossing the image boundary. A guest must omit X86_FEATURE_LM and enter or resume SMM; 32-bit hosts cannot reach the overflowing 64-bit save-state paths.

CVSS severity7.1
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux KVM 6.0 through 6.0.7 allows guest OS users to read host memory or interrupt the host. On a 64-bit host, KVM's SMM emulator walks 16 general-purpose registers through a 32-bit SMRAM image when guest long mode is absent, crossing the image boundary. A guest must omit X86_FEATURE_LM and enter or resume SMM; 32-bit hosts cannot reach the overflowing 64-bit save-state paths.

The record

CVE
CVE-2022-49883
Published
May 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=6.0
  2. Affected versionversion=b443183a25ab61840a12de92f8822849e017b9c8 <696db303e54f7352623d9f640e6c51d8fa9d5588
  3. Affected versionversion=b443183a25ab61840a12de92f8822849e017b9c8 <a7ebfbea0f52550d7cdf12c38f3f5eaa7b2b6494

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=b443183a25ab61840a12de92f8822849e017b9c8 <696db303e54f7352623d9f640e6c51d8fa9d5588; version=b443183a25ab61840a12de92f8822849e017b9c8 <a7ebfbea0f52550d7cdf12c38f3f5eaa7b2b6494

Published CVSS scores

7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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

CWE-125Out-of-bounds Read
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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