CVE-2022-49992

Kernel crash via mismatched swap-entry conversion

Published Jun 18, 2025 · Updated May 11, 2026

Denial of service in Linux kernel 5.19 allows local users to crash the kernel by invoking mprotect on a genuine swap entry. The mm/mprotect change_pte_range path passes a genuine swap entry to pfn_swap_entry_to_page() without first verifying a write migration entry. Local low-privilege access is required, and successful triggering causes a kernel BUG and interrupts the system.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Denial of service in Linux kernel 5.19 allows local users to crash the kernel by invoking mprotect on a genuine swap entry. The mm/mprotect change_pte_range path passes a genuine swap entry to pfn_swap_entry_to_page() without first verifying a write migration entry. Local low-privilege access is required, and successful triggering causes a kernel BUG and interrupts the system.

The record

CVE
CVE-2022-49992
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 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=5.19
  2. Affected versionversion=6c287605fd56466e645693eff3ae7c08fba56e0a <3d2f78f08cd8388035ac375e731ec1ac1b79b09d
  3. Affected versionversion=6c287605fd56466e645693eff3ae7c08fba56e0a <5fcf81e308d1f4ae95f31690d2a80b7061385ff9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=6c287605fd56466e645693eff3ae7c08fba56e0a <3d2f78f08cd8388035ac375e731ec1ac1b79b09d; version=6c287605fd56466e645693eff3ae7c08fba56e0a <5fcf81e308d1f4ae95f31690d2a80b7061385ff9

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 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

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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