CVE-2022-49562

Host interruption via misresolved VM_PFNMAP guest PTEs

Published Feb 26, 2025 · Updated Aug 5, 2026

Improper memory access in Linux KVM allows local users to interrupt host operation through VM_PFNMAP-backed guest memory mappings. The x86 guest PTE accessed/dirty-bit path treats vm_pgoff as a physical-frame base and maps the resulting unrelated PFNs into kernel space. Reachability requires local KVM access and non-/dev/mem VM_PFNMAP guest memory; the public record does not distinguish a hang, crash, or reboot.

CVSS severity5.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper memory access in Linux KVM allows local users to interrupt host operation through VM_PFNMAP-backed guest memory mappings. The x86 guest PTE accessed/dirty-bit path treats vm_pgoff as a physical-frame base and maps the resulting unrelated PFNs into kernel space. Reachability requires local KVM access and non-/dev/mem VM_PFNMAP guest memory; the public record does not distinguish a hang, crash, or reboot.

The record

CVE
CVE-2022-49562
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.2
  2. Affected versionversion=bd53cb35a3e9adb73a834a36586e9ad80e877767 <38b888911e8dc89b89d8147cfb1d2dbe6373bf78
  3. Affected versionversion=bd53cb35a3e9adb73a834a36586e9ad80e877767 <8089e5e1d18402fb8152d6b6815450a36fffa9b0
  4. Affected versionversion=bd53cb35a3e9adb73a834a36586e9ad80e877767 <f122dfe4476890d60b8c679128cd2259ec96a24c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.2; version=bd53cb35a3e9adb73a834a36586e9ad80e877767 <38b888911e8dc89b89d8147cfb1d2dbe6373bf78; version=bd53cb35a3e9adb73a834a36586e9ad80e877767 <8089e5e1d18402fb8152d6b6815450a36fffa9b0; version=bd53cb35a3e9adb73a834a36586e9ad80e877767 <f122dfe4476890d60b8c679128cd2259ec96a24c

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

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

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo