CVE-2025-38390

Service interruption via unfreed notifier callback nodes

Published Jul 25, 2025 · Updated May 11, 2026

Memory leakage in the Linux kernel ARM FF-A driver allows local users to cause a service interrupt through notifier registration churn. The notifier unregistration path in drivers/firmware/arm_ffa/driver.c removes a callback node from its hash table but fails to free the allocation. Repeated registration and unregistration requires local low-privileged access and can exhaust unreclaimed kernel memory, interrupting the host.

CVSS severity5.5
Medium
EPSS probability0.16%
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 the Linux kernel ARM FF-A driver allows local users to cause a service interrupt through notifier registration churn. The notifier unregistration path in drivers/firmware/arm_ffa/driver.c removes a callback node from its hash table but fails to free the allocation. Repeated registration and unregistration requires local low-privileged access and can exhaust unreclaimed kernel memory, interrupting the host.

The record

CVE
CVE-2025-38390
Published
Jul 25, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.7
  2. Affected versionversion=e0573444edbf4ee7e3c191d3d08a4ccbd26628be <076fa20b4f5737c34921dbb152f9efceaee571b2
  3. Affected versionversion=e0573444edbf4ee7e3c191d3d08a4ccbd26628be <938827c440564b2cf2f9b804d1fe81ce8267eded
  4. Affected versionversion=e0573444edbf4ee7e3c191d3d08a4ccbd26628be <a833d31ad867103ba72a0b73f3606f4ab8601719

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=e0573444edbf4ee7e3c191d3d08a4ccbd26628be <076fa20b4f5737c34921dbb152f9efceaee571b2; version=e0573444edbf4ee7e3c191d3d08a4ccbd26628be <938827c440564b2cf2f9b804d1fe81ce8267eded; version=e0573444edbf4ee7e3c191d3d08a4ccbd26628be <a833d31ad867103ba72a0b73f3606f4ab8601719

Published CVSS scores

5.5CanonicalCVSS: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

CWE-401Missing Release of Memory after Effective Lifetime
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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