CVE-2025-38444

Local service interruption via RAID10 request memory leak

Published Jul 25, 2025 · Updated May 23, 2026

Memory leakage in Linux kernel RAID10 allows local users to exhaust kernel memory by issuing I/O with the REQ_NOWAIT flag. The raid10_make_request path allocates a request from its mempool, but raid10_read_request or raid10_write_request fails to free it when registering a new nonblocking request. Reaching the flaw requires local low-privileged access and an active RAID10 array; repeated requests degrade availability through memory exhaustion.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in Linux kernel RAID10 allows local users to exhaust kernel memory by issuing I/O with the REQ_NOWAIT flag. The raid10_make_request path allocates a request from its mempool, but raid10_read_request or raid10_write_request fails to free it when registering a new nonblocking request. Reaching the flaw requires local low-privileged access and an active RAID10 array; repeated requests degrade availability through memory exhaustion.

The record

CVE
CVE-2025-38444
Published
Jul 25, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=39db562b3fedb93978a7e42dd216b306740959f8 <10c6021a609deb95f23f0cc2f89aa9d4bffb14c7
  2. Affected versionversion=5.15.111 <5.15.189
  3. Affected versionversion=5.17
  4. Affected versionversion=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <2941155d9a5ae098b480d551f3a5f8605d4f9af5
  5. Affected versionversion=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <43806c3d5b9bb7d74ba4e33a6a8a41ac988bde24
  6. Affected versionversion=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <8fc3d7b23d139e3cbc944c15d99b3cdbed797d2d
  7. Affected versionversion=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <9af149ca9d0dab6e59e813519d309eff62499864
  8. Affected versionversion=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <ed7bcd9f617e4107ac0813c516e72e6b8f6029bd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=39db562b3fedb93978a7e42dd216b306740959f8 <10c6021a609deb95f23f0cc2f89aa9d4bffb14c7; version=5.15.111 <5.15.189; version=5.17; version=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <2941155d9a5ae098b480d551f3a5f8605d4f9af5; version=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <43806c3d5b9bb7d74ba4e33a6a8a41ac988bde24; version=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <8fc3d7b23d139e3cbc944c15d99b3cdbed797d2d; version=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <9af149ca9d0dab6e59e813519d309eff62499864; version=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <ed7bcd9f617e4107ac0813c516e72e6b8f6029bd

Published CVSS scores

5.5UbuntuCVSS: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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.001OS Exhaustion Flood

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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