CVE-2025-37817

Kernel crash via repeated MCB device free

Published May 8, 2025 · Updated May 11, 2026

Double free in the Linux kernel MCB parser allows local users to crash the kernel through a failed MCB device registration. When mcb_device_register() fails, put_device() releases mdev, but chameleon_parse_gdd() follows its error path and frees the same object again. Reachability requires CAP_SYS_MODULE or CAP_SYS_ADMIN and a device_add() failure that is not attacker-controllable; the grounded consequence is service interruption.

CVSS severity7.8
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in the Linux kernel MCB parser allows local users to crash the kernel through a failed MCB device registration. When mcb_device_register() fails, put_device() releases mdev, but chameleon_parse_gdd() follows its error path and frees the same object again. Reachability requires CAP_SYS_MODULE or CAP_SYS_ADMIN and a device_add() failure that is not attacker-controllable; the grounded consequence is service interruption.

The record

CVE
CVE-2025-37817
Published
May 8, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 8, 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=3.15
  2. Affected versionversion=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <4ffe8c9fb561e4427dd1a3056cd5b3685b74f78d
  3. Affected versionversion=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <59f993cd36b6e28a394ba3d977e8ffe5c9884e3b
  4. Affected versionversion=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <7c7f1bfdb2249f854a736d9b79778c7e5a29a150
  5. Affected versionversion=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <96838eb1836fd372e42be5db84f0b333b65146a6
  6. Affected versionversion=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <bcc7d58ee5173e34306026bd01e1fbf75e169d37
  7. Affected versionversion=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <c5b8a549ef1fcc6066b037a3962c79d60465ba0b
  8. Affected versionversion=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <d70184958b0ea8c0fd52e2b456654b503e769fc8
  9. Affected versionversion=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <df1a5d5c6134224f9298e5189230f9d29ae50cac

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3.15; version=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <4ffe8c9fb561e4427dd1a3056cd5b3685b74f78d; version=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <59f993cd36b6e28a394ba3d977e8ffe5c9884e3b; version=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <7c7f1bfdb2249f854a736d9b79778c7e5a29a150; version=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <96838eb1836fd372e42be5db84f0b333b65146a6; version=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <bcc7d58ee5173e34306026bd01e1fbf75e169d37; version=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <c5b8a549ef1fcc6066b037a3962c79d60465ba0b; version=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <d70184958b0ea8c0fd52e2b456654b503e769fc8; version=3764e82e5150d87b205c10cd78a9c9ab86fbfa51 <df1a5d5c6134224f9298e5189230f9d29ae50cac

Published CVSS scores

5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CanonicalCVSS:3.1/AV:L/AC:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
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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