CVE-2025-21773

Kernel crash via unchecked USB serial pointer

Published Feb 27, 2025 · Updated May 11, 2026

NULL pointer dereference in the etas_es58x CAN USB driver in Linux allows local users to crash the kernel via a spoofed device. es58x_devlink_info_get passes udev->serial to devlink_info_serial_number_put without checking whether the USB serial pointer is NULL. Triggering requires a locally attached or emulated USB device that omits its serial string and a devlink information request; the resulting kernel fault interrupts the host.

CVSS severity5.5
Medium
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

NULL pointer dereference in the etas_es58x CAN USB driver in Linux allows local users to crash the kernel via a spoofed device. es58x_devlink_info_get passes udev->serial to devlink_info_serial_number_put without checking whether the USB serial pointer is NULL. Triggering requires a locally attached or emulated USB device that omits its serial string and a devlink information request; the resulting kernel fault interrupts the host.

The record

CVE
CVE-2025-21773
Published
Feb 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1200, T1499
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=6.2
  2. Affected versionversion=9f06631c3f1f0f298536443df85a6837ba4c5f5c <1590667a60753ee5a54871f2840ceefd4a7831fa
  3. Affected versionversion=9f06631c3f1f0f298536443df85a6837ba4c5f5c <5059ea98d7bc133903d3e47ab36df6ed11d0c95f
  4. Affected versionversion=9f06631c3f1f0f298536443df85a6837ba4c5f5c <722e8e1219c8b6ac2865011fe339315d6a8d0721
  5. Affected versionversion=9f06631c3f1f0f298536443df85a6837ba4c5f5c <a1ad2109ce41c9e3912dadd07ad8a9c640064ffb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=9f06631c3f1f0f298536443df85a6837ba4c5f5c <1590667a60753ee5a54871f2840ceefd4a7831fa; version=9f06631c3f1f0f298536443df85a6837ba4c5f5c <5059ea98d7bc133903d3e47ab36df6ed11d0c95f; version=9f06631c3f1f0f298536443df85a6837ba4c5f5c <722e8e1219c8b6ac2865011fe339315d6a8d0721; version=9f06631c3f1f0f298536443df85a6837ba4c5f5c <a1ad2109ce41c9e3912dadd07ad8a9c640064ffb

Published CVSS scores

5.5Canonical UbuntuCVSS: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.

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
T1200Hardware Additions
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

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