CVE-2025-21916

Kernel warning via unchecked USB endpoint address

Published Apr 1, 2025 · Updated May 23, 2026

Improper USB endpoint validation in Linux kernel 6.10 allows local users to trigger a kernel warning via a crafted USB device. In cxacru_bind(), the driver accepts endpoints by type and count without verifying their addresses, then builds URBs for the fixed CXACRU_EP_CMD address. Exploitation requires local low-privileged access and a cxacru-compatible USB device with misleading endpoint descriptors; the demonstrated consequence is repeated warning output rather than data access or code execution.

CVSS severity3.3
Low
EPSS probability0.22%
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

Improper USB endpoint validation in Linux kernel 6.10 allows local users to trigger a kernel warning via a crafted USB device. In cxacru_bind(), the driver accepts endpoints by type and count without verifying their addresses, then builds URBs for the fixed CXACRU_EP_CMD address. Exploitation requires local low-privileged access and a cxacru-compatible USB device with misleading endpoint descriptors; the demonstrated consequence is repeated warning output rather than data access or code execution.

The record

CVE
CVE-2025-21916
Published
Apr 1, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1200
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 1, 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

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=1aac4be1aaa5177506219f01dce5e29194e5e95a <bf4409f84023b52b5e9b36c0a071a121eee42138
  2. Affected versionversion=23926d316d2836315cb113569f91393266eb5b47 <dcd592ab9dd8a2bfc36e75583b9006db2a77ec24
  3. Affected versionversion=2eabb655a968b862bc0c31629a09f0fbf3c80d51 <903b80c21458bb1e34c3a78c5fdc553821e357f8
  4. Affected versionversion=2eabb655a968b862bc0c31629a09f0fbf3c80d51 <c90aad369899a607cfbc002bebeafd51e31900cd
  5. Affected versionversion=2eabb655a968b862bc0c31629a09f0fbf3c80d51 <cfc295f7cccf66cbd5123416bcf1bee2e1bd37de
  6. Affected versionversion=4.19.317 <4.20
  7. Affected versionversion=5.10.221 <5.10.235
  8. Affected versionversion=5.15.162 <5.15.179
  9. Affected versionversion=5159a81924311c1ec786ad9fdef784ead8676a6a
  10. Affected versionversion=5.4.279 <5.4.291
  11. Affected versionversion=5584c776a1af7807ca815ee6265f2c1429fc5727 <197e78076c5ecd895f109158c4ea2954b9919af6
  12. Affected versionversion=6.10
  13. Affected versionversion=6.1.97 <6.1.131
  14. Affected versionversion=6.6.37 <6.6.83
  15. Affected versionversion=6.9.8 <6.10
  16. Affected versionversion=75ddbf776dd04a09fb9e5267ead5d0c989f84506 <319529e0356bd904528c64647725a2272d297c83
  17. Affected versionversion=ac9007520e392541a29daebaae8b9109007bc781
  18. Affected versionversion=f536f09eb45e4de8d1b9accee9d992aa1846f1d4 <a0475a885d69849b1ade38add6d64338dfa83a8f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1aac4be1aaa5177506219f01dce5e29194e5e95a <bf4409f84023b52b5e9b36c0a071a121eee42138; version=23926d316d2836315cb113569f91393266eb5b47 <dcd592ab9dd8a2bfc36e75583b9006db2a77ec24; version=2eabb655a968b862bc0c31629a09f0fbf3c80d51 <903b80c21458bb1e34c3a78c5fdc553821e357f8; version=2eabb655a968b862bc0c31629a09f0fbf3c80d51 <c90aad369899a607cfbc002bebeafd51e31900cd; version=2eabb655a968b862bc0c31629a09f0fbf3c80d51 <cfc295f7cccf66cbd5123416bcf1bee2e1bd37de; version=4.19.317 <4.20; version=5.10.221 <5.10.235; version=5.15.162 <5.15.179; version=5159a81924311c1ec786ad9fdef784ead8676a6a; version=5.4.279 <5.4.291; version=5584c776a1af7807ca815ee6265f2c1429fc5727 <197e78076c5ecd895f109158c4ea2954b9919af6; version=6.10; version=6.1.97 <6.1.131; version=6.6.37 <6.6.83; version=6.9.8 <6.10; version=75ddbf776dd04a09fb9e5267ead5d0c989f84506 <319529e0356bd904528c64647725a2272d297c83; version=ac9007520e392541a29daebaae8b9109007bc781; version=f536f09eb45e4de8d1b9accee9d992aa1846f1d4 <a0475a885d69849b1ade38add6d64338dfa83a8f

Published CVSS scores

3.3Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/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

T1200Hardware Additions

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