CVE-2025-21794Public exploit

Kernel crash via unterminated endpoint array

Published Feb 27, 2025 · Updated May 11, 2026

Out-of-bounds read in the Linux kernel allows local users to crash affected systems through a crafted USB HID device. The hid-thrustmaster driver's one-byte ep_addr array lacks the zero terminator expected by usb_check_int_endpoints(), so its loop reads beyond the stack array. Reaching the flaw requires the vulnerable driver to probe a matching Thrustmaster USB HID device; exploitation interrupts the entire system.

CVSS severity7.1
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel allows local users to crash affected systems through a crafted USB HID device. The hid-thrustmaster driver's one-byte ep_addr array lacks the zero terminator expected by usb_check_int_endpoints(), so its loop reads beyond the stack array. Reaching the flaw requires the vulnerable driver to probe a matching Thrustmaster USB HID device; exploitation interrupts the entire system.

The record

CVE
CVE-2025-21794
Published
Feb 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, CAPEC-540, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 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=220883fba32549a34f0734e4859d07f4dcd56992 <436f48c864186e9413d1b7c6e91767cc9e1a65b8
  2. Affected versionversion=50420d7c79c37a3efe4010ff9b1bb14bc61ebccf <0b43d98ff29be3144e86294486b1373b5df74c0e
  3. Affected versionversion=6.12.13 <6.12.16
  4. Affected versionversion=6.13.2 <6.13.4
  5. Affected versionversion=6.6.76 <6.6.79
  6. Affected versionversion=816e84602900f7f951458d743fa12769635ebfd5 <73e36a699b9f46322ffb81f072a24e64f728dba7
  7. Affected versionversion=ae730deded66150204c494282969bfa98dc3ae67 <f3ce05283f6cb6e19c220f5382def43dc5bd56b9
  8. Affected versionversion=e5bcae4212a6a4b4204f46a1b8bcba08909d2007 <cdd9a1ea23ff1a272547217100663e8de4eada40

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=220883fba32549a34f0734e4859d07f4dcd56992 <436f48c864186e9413d1b7c6e91767cc9e1a65b8; version=50420d7c79c37a3efe4010ff9b1bb14bc61ebccf <0b43d98ff29be3144e86294486b1373b5df74c0e; version=6.12.13 <6.12.16; version=6.13.2 <6.13.4; version=6.6.76 <6.6.79; version=816e84602900f7f951458d743fa12769635ebfd5 <73e36a699b9f46322ffb81f072a24e64f728dba7; version=ae730deded66150204c494282969bfa98dc3ae67 <f3ce05283f6cb6e19c220f5382def43dc5bd56b9; version=e5bcae4212a6a4b4204f46a1b8bcba08909d2007 <cdd9a1ea23ff1a272547217100663e8de4eada40

Published CVSS scores

7.1CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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.

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 exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CAPEC-540Overread Buffers
T1499.004Application or System Exploitation

Public exploit references

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

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