CVE-2023-1582

Local system crash via migration-entry mapcount race

Published Apr 5, 2023 · Updated Feb 13, 2025

A race condition in Linux kernel task_mmu.c before 5.17-rc4 allows local users to crash the kernel through concurrent procfs access. smaps_account reads a page mapcount from a migration entry while another thread applies MADV_FREE, reaching the PageDoubleMap BUG check. A local low-privileged user must win the narrow timing window by reading a process's smaps data while memory advice changes the same mapping.

CVSS severity4.7
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in Linux kernel task_mmu.c before 5.17-rc4 allows local users to crash the kernel through concurrent procfs access. smaps_account reads a page mapcount from a migration entry while another thread applies MADV_FREE, reaching the PageDoubleMap BUG check. A local low-privileged user must win the narrow timing window by reading a process's smaps data while memory advice changes the same mapping.

The record

CVE
CVE-2023-1582
Published
Apr 5, 2023
Updated
Feb 13, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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?

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

  1. Affected versionversion=Linux Kernel prior to Kernel 5.7 RC14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux Kernel prior to Kernel 5.7 RC14

Published CVSS scores

4.7CanonicalCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7CISA-ADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7NIST NVDCVSS:3.1/AV:L/AC:H/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-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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