CVE-2025-22003

System crash via unterminated UCAN firmware string

Published Apr 3, 2025 · Updated May 11, 2026

Out-of-bounds read in the UCAN USB-CAN driver in Linux allows local users to crash the system through a malformed firmware string. The ucan_get_fw_str path passes a non-NUL-terminated USB response to strscpy with a destination size one byte larger than the source, causing a one-byte read past the buffer while checking for truncation. Exploitation requires local access and a UCAN USB-CAN adapter that returns a full-length unterminated firmware string; the documented consequence is availability loss rather than data access or modification.

CVSS severity5.5
Medium
EPSS probability0.19%
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 UCAN USB-CAN driver in Linux allows local users to crash the system through a malformed firmware string. The ucan_get_fw_str path passes a non-NUL-terminated USB response to strscpy with a destination size one byte larger than the source, causing a one-byte read past the buffer while checking for truncation. Exploitation requires local access and a UCAN USB-CAN adapter that returns a full-length unterminated firmware string; the documented consequence is availability loss rather than data access or modification.

The record

CVE
CVE-2025-22003
Published
Apr 3, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 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

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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=6.2
  2. Affected versionversion=7fdaf8966aae476deafe11f9a0067ff588615444 <1d22a122ffb116c3cf78053e812b8b21f8852ee9
  3. Affected versionversion=7fdaf8966aae476deafe11f9a0067ff588615444 <8cec9e314d3360fc1d8346297c41a6ee45cb45a9
  4. Affected versionversion=7fdaf8966aae476deafe11f9a0067ff588615444 <a4994161a61bc8fd71d105c579d847cefee99262
  5. Affected versionversion=7fdaf8966aae476deafe11f9a0067ff588615444 <cc29775a8a72d7f3b56cc026796ad99bd65804a7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=7fdaf8966aae476deafe11f9a0067ff588615444 <1d22a122ffb116c3cf78053e812b8b21f8852ee9; version=7fdaf8966aae476deafe11f9a0067ff588615444 <8cec9e314d3360fc1d8346297c41a6ee45cb45a9; version=7fdaf8966aae476deafe11f9a0067ff588615444 <a4994161a61bc8fd71d105c579d847cefee99262; version=7fdaf8966aae476deafe11f9a0067ff588615444 <cc29775a8a72d7f3b56cc026796ad99bd65804a7

Published CVSS scores

5.5CISACVSS: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-125Out-of-bounds Read

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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