CVE-2025-38383

System crash via shared NUMA heap race

Published Jul 25, 2025 · Updated May 11, 2026

A data race in the mm/vmalloc component of Linux kernel 6.9 allows local users to crash the system through /proc/vmallocinfo. show_numa_info() reads and writes heap state referenced by m->private while that state is shared across concurrent vmalloc_info_show() calls on multiple CPUs. Access requires root because the proc file has mode 0400, and exploitation is limited to availability loss or unpredictable kernel behavior.

CVSS severity4.7
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A data race in the mm/vmalloc component of Linux kernel 6.9 allows local users to crash the system through /proc/vmallocinfo. show_numa_info() reads and writes heap state referenced by m->private while that state is shared across concurrent vmalloc_info_show() calls on multiple CPUs. Access requires root because the proc file has mode 0400, and exploitation is limited to availability loss or unpredictable kernel behavior.

The record

CVE
CVE-2025-38383
Published
Jul 25, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-820, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 25, 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=6.9
  2. Affected versionversion=8e1d743f2c2671aa54f6f91a2b33823f92512870 <5c5f0468d172ddec2e333d738d2a1f85402cf0bc
  3. Affected versionversion=8e1d743f2c2671aa54f6f91a2b33823f92512870 <5c966f447a584ece3c70395898231aeb56256ee7
  4. Affected versionversion=8e1d743f2c2671aa54f6f91a2b33823f92512870 <ead91de35d9cd5c4f80ec51e6020f342079170af

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=6.9; version=8e1d743f2c2671aa54f6f91a2b33823f92512870 <5c5f0468d172ddec2e333d738d2a1f85402cf0bc; version=8e1d743f2c2671aa54f6f91a2b33823f92512870 <5c966f447a584ece3c70395898231aeb56256ee7; version=8e1d743f2c2671aa54f6f91a2b33823f92512870 <ead91de35d9cd5c4f80ec51e6020f342079170af

Published CVSS scores

4.7UbuntuCVSS: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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-820Missing Synchronization
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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