CVE-2025-40325

Warning call trace via nonblocking RAID10 discard

Published Apr 18, 2025 · Updated May 23, 2026

Improper synchronization in Linux kernel RAID10 allows local users to trigger warning call traces through nonblocking discard requests. raid10_handle_discard warns on REQ_NOWAIT and then calls wait_barrier in blocking mode instead of passing the request flag and returning a would-block error. Reachability requires a local discard against an active RAID10 array; the documented consequence is a misleading kernel warning trace.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper synchronization in Linux kernel RAID10 allows local users to trigger warning call traces through nonblocking discard requests. raid10_handle_discard warns on REQ_NOWAIT and then calls wait_barrier in blocking mode instead of passing the request flag and returning a would-block error. Reachability requires a local discard against an active RAID10 array; the documented consequence is a misleading kernel warning trace.

The record

CVE
CVE-2025-40325
Published
Apr 18, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 18, 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
  2. Affected versionversion=5.15.111 <5.16
  3. Affected versionversion=5.17
  4. Affected versionversion=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <31d3156efe909b53ba174861a3da880c688f5edc
  5. Affected versionversion=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <31ff67982c5fa39c0093b9d9f429fef91c2494b7
  6. Affected versionversion=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <3db4404435397a345431b45f57876a3df133f3b4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=39db562b3fedb93978a7e42dd216b306740959f8; version=5.15.111 <5.16; version=5.17; version=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <31d3156efe909b53ba174861a3da880c688f5edc; version=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <31ff67982c5fa39c0093b9d9f429fef91c2494b7; version=c9aa889b035fca4598ae985a0f0c76ebbb547ad2 <3db4404435397a345431b45f57876a3df133f3b4

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.

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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

No sourced classifications are available.

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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