CVE-2022-3623

System crash or kernel-memory exposure via wrong lock

Published Oct 20, 2022 · Updated Apr 15, 2025

Race condition in the hugetlb page lookup in Linux Kernel allows local users to crash the system or expose kernel memory. follow_page_pte and follow_huge_pmd use a normal PTE or PMD lock for contiguous huge pages instead of huge_pte_lock, leaving entries unstable during migration. Reachability requires contiguous PTE or PMD HugeTLB support, such as on ARM64, and concurrent page lookup and migration; an incorrect page can cause data inconsistency, a kernel crash, or kernel-memory disclosure.

CVSS severity5.0
Medium
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the hugetlb page lookup in Linux Kernel allows local users to crash the system or expose kernel memory. follow_page_pte and follow_huge_pmd use a normal PTE or PMD lock for contiguous huge pages instead of huge_pte_lock, leaving entries unstable during migration. Reachability requires contiguous PTE or PMD HugeTLB support, such as on ARM64, and concurrent page lookup and migration; an incorrect page can cause data inconsistency, a kernel crash, or kernel-memory disclosure.

The record

CVE
CVE-2022-3623
Published
Oct 20, 2022
Updated
Apr 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=n/a

Published CVSS scores

5.0VulDBCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
7.5NIST NVDCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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