CVE-2025-38402

Denial of service via invalid RSS key size

Published Jul 25, 2025 · Updated May 11, 2026

Denial of service in Linux 6.7 through 6.16-rc4 allows local users to trigger a large allocation failure via an RSS query. The idpf get_rxfh_key_size callback returns the negative EOPNOTSUPP error through an unsigned 32-bit size, which ethtool treats as a huge allocation length. The user must query an idpf device without RSS capability; the resulting allocation failure interrupts the operation and can exhaust kernel memory.

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

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Linux 6.7 through 6.16-rc4 allows local users to trigger a large allocation failure via an RSS query. The idpf get_rxfh_key_size callback returns the negative EOPNOTSUPP error through an unsigned 32-bit size, which ethtool treats as a huge allocation length. The user must query an idpf device without RSS capability; the resulting allocation failure interrupts the operation and can exhaust kernel memory.

The record

CVE
CVE-2025-38402
Published
Jul 25, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
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=02cbfba1add5bd9088c7d14c6b93b77a6ea8f3bb <018ff57fd79c38be989b8b3248bbe69bcfb77160
  2. Affected versionversion=02cbfba1add5bd9088c7d14c6b93b77a6ea8f3bb <326e384ee7acbebf0541ac064ac7a4dd1f1dde1d
  3. Affected versionversion=02cbfba1add5bd9088c7d14c6b93b77a6ea8f3bb <f77bf1ebf8ff6301ccdbc346f7b52db928f9cbf8
  4. Affected versionversion=6.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=02cbfba1add5bd9088c7d14c6b93b77a6ea8f3bb <018ff57fd79c38be989b8b3248bbe69bcfb77160; version=02cbfba1add5bd9088c7d14c6b93b77a6ea8f3bb <326e384ee7acbebf0541ac064ac7a4dd1f1dde1d; version=02cbfba1add5bd9088c7d14c6b93b77a6ea8f3bb <f77bf1ebf8ff6301ccdbc346f7b52db928f9cbf8; version=6.7

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.0Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L
2.0Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L

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-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo