Linux Kernel up to 6.16.9 tracing dynamic_events privilege escalation

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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.16.9. It has been declared as critical. The impacted element is the function dynamic_events of the component tracing. Executing a manipulation can lead to an unknown weakness. This vulnerability is handled as CVE-2025-40021. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.16.9. It has been declared as critical. This vulnerability affects the function dynamic_events of the component tracing. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: tracing: dynevent: Add a missing lockdown check on dynevent Since dynamic_events interface on tracefs is compatible with kprobe_events and uprobe_events, it should also check the lockdown status and reject if it is set.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2025-40021 since 04/16/2025. The exploitation appears to be difficult. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 274816 (Debian dsa-6053 : affs-modules-6.1.0-37-4kc-malta-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.245, 5.15.194, 6.1.155, 6.6.109, 6.12.50 or 6.16.10 eliminates this vulnerability. Applying the patch f3ac1f4eaba58e57943efa3e8b8d71fa7aab0abf/0d41604d2d53c1abe27fefb54b37a8f6642a4d74/07b1f63b5f86765793fab44d3d4c2be681cddafb/3887f3814c0e770e6b73567fe0f83a2c01a6470c/573b1e39edfcb7b4eecde0f1664455a1f4462eee/b47c4e06687a5a7b6c6ef4bd303fcfe4430b26bb/456c32e3c4316654f95f9d49c12cbecfb77d5660 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (274816) and CERT Bund (WID-SEC-2025-2407). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Linux Kernel
  • Dell NetWorker

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.4

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Privilege escalation
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 274816
Nessus Name: Debian dsa-6053 : affs-modules-6.1.0-37-4kc-malta-di - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.245/5.15.194/6.1.155/6.6.109/6.12.50/6.16.10
Patch: f3ac1f4eaba58e57943efa3e8b8d71fa7aab0abf/0d41604d2d53c1abe27fefb54b37a8f6642a4d74/07b1f63b5f86765793fab44d3d4c2be681cddafb/3887f3814c0e770e6b73567fe0f83a2c01a6470c/573b1e39edfcb7b4eecde0f1664455a1f4462eee/b47c4e06687a5a7b6c6ef4bd303fcfe4430b26bb/456c32e3c4316654f95f9d49c12cbecfb77d5660

Timelineinfo

04/16/2025 CVE reserved
10/24/2025 +191 days Advisory disclosed
10/24/2025 +0 days VulDB entry created
02/02/2026 +101 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-40021 (🔒)
GCVE (CVE): GCVE-0-2025-40021
GCVE (VulDB): GCVE-100-329776
CERT Bund: WID-SEC-2025-2407 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 10/24/2025 15:28
Updated: 02/02/2026 10:43
Changes: 10/24/2025 15:28 (58), 10/28/2025 09:54 (7), 11/12/2025 08:28 (2), 12/09/2025 10:18 (1), 02/02/2026 10:43 (1)
Complete: 🔍
Cache ID: 216::103

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