Linux Kernel up to 6.16.7/6.17-rc5 hsr hsr_get_port_ndev use after free

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.16.7/6.17-rc5. The affected element is the function hsr_get_port_ndev of the component hsr. The manipulation results in use after free. This vulnerability is cataloged as CVE-2025-39872. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.16.7/6.17-rc5. Affected is the function hsr_get_port_ndev of the component hsr. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: hsr: hold rcu and dev lock for hsr_get_port_ndev hsr_get_port_ndev calls hsr_for_each_port, which need to hold rcu lock. On the other hand, before return the port device, we need to hold the device reference to avoid UaF in the caller function.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2025-39872 since 04/16/2025. The exploitability is told to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/16/2026).

The vulnerability scanner Nessus provides a plugin with the ID 265876 (Linux Distros Unpatched Vulnerability : CVE-2025-39872), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.16.8 or 6.17-rc6 eliminates this vulnerability. Applying the patch 68a6729afd3e8e9a2a32538642ce92b96ccf9b1d/847748fc66d08a89135a74e29362a66ba4e3ab15 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 (265876) and CERT Bund (WID-SEC-2025-2107). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Dell Secure Connect Gateway
  • IBM QRadar SIEM
  • 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: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265876
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-39872

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.16.8/6.17-rc6
Patch: 68a6729afd3e8e9a2a32538642ce92b96ccf9b1d/847748fc66d08a89135a74e29362a66ba4e3ab15

Timelineinfo

04/16/2025 CVE reserved
09/23/2025 +160 days Advisory disclosed
09/23/2025 +0 days VulDB entry created
02/16/2026 +146 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39872 (🔒)
GCVE (CVE): GCVE-0-2025-39872
GCVE (VulDB): GCVE-100-325584
CERT Bund: WID-SEC-2025-2107 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/23/2025 08:28
Updated: 02/16/2026 07:56
Changes: 09/23/2025 08:28 (59), 09/28/2025 18:35 (2), 12/01/2025 19:25 (7), 12/13/2025 10:30 (11), 01/12/2026 04:53 (1), 02/09/2026 08:13 (1), 02/16/2026 07:56 (1)
Complete: 🔍
Cache ID: 216::103

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