CVE-2025-37993

Kernel fault via uninitialized CAN transmit spinlock

Published May 29, 2025 · Updated May 11, 2026

Denial of service in Linux kernel 6.9 allows local users to trigger a kernel fault by sending a CAN frame through an m_can device. m_can_class_allocate_dev leaves tx_handling_spinlock uninitialized, and m_can_start_xmit later attempts to acquire that invalid lock. Access to a configured m_can CAN interface and permission to transmit frames are required; the documented consequence is a spinlock bad-magic fault.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel 6.9 allows local users to trigger a kernel fault by sending a CAN frame through an m_can device. m_can_class_allocate_dev leaves tx_handling_spinlock uninitialized, and m_can_start_xmit later attempts to acquire that invalid lock. Access to a configured m_can CAN interface and permission to transmit frames are required; the documented consequence is a spinlock bad-magic fault.

The record

CVE
CVE-2025-37993
Published
May 29, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 29, 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=1fa80e23c15051edc1c594270517de3517ded798 <2ecce25ea296f328d79070ee36229a15aeeb7aca
  2. Affected versionversion=1fa80e23c15051edc1c594270517de3517ded798 <7d5379cfecfdd665e4206bc4f19824656388779f
  3. Affected versionversion=1fa80e23c15051edc1c594270517de3517ded798 <dcaeeb8ae84c5506ebc574732838264f3887738c
  4. Affected versionversion=6.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1fa80e23c15051edc1c594270517de3517ded798 <2ecce25ea296f328d79070ee36229a15aeeb7aca; version=1fa80e23c15051edc1c594270517de3517ded798 <7d5379cfecfdd665e4206bc4f19824656388779f; version=1fa80e23c15051edc1c594270517de3517ded798 <dcaeeb8ae84c5506ebc574732838264f3887738c; version=6.9

Published CVSS scores

2.0SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
4.4SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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

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

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Your stack

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