Linux Kernel up to 6.17-rc2 mod_hdcp_hdcp1_create_session null pointer dereference

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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.17-rc2. The impacted element is the function mod_hdcp_hdcp1_create_session. This manipulation causes null pointer dereference. The identification of this vulnerability is CVE-2025-39675. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.17-rc2 and classified as critical. Affected by this vulnerability is the function mod_hdcp_hdcp1_create_session. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Add null pointer check in mod_hdcp_hdcp1_create_session() The function mod_hdcp_hdcp1_create_session() calls the function get_first_active_display(), but does not check its return value. The return value is a null pointer if the display list is empty. This will lead to a null pointer dereference. Add a null pointer check for get_first_active_display() and return MOD_HDCP_STATUS_DISPLAY_NOT_FOUND if the function return null. This is similar to the commit c3e9826a2202 ("drm/amd/display: Add null pointer check for get_first_active_display()"). (cherry picked from commit 5e43eb3cd731649c4f8b9134f857be62a416c893)

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2025-39675 since 04/16/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 261611 (Linux Distros Unpatched Vulnerability : CVE-2025-39675), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.15.190, 6.1.149, 6.6.103, 6.12.44, 6.16.4 or 6.17-rc3 eliminates this vulnerability. Applying the patch 2af45aadb7b5d3852c76e2d1e985289ada6f48bf/ee0373b20bb67b1f00a1b25ccd24c8ac996b6446/857b8387a9777e42b36e0400be99b54c251eaf9a/97fc94c5fd3c6ac5a13e457d38ee247737b8c4bd/2ee86b764c54e0d6a5464fb023b630fdf20869cd/7a2ca2ea64b1b63c8baa94a8f5deb70b2248d119 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 (261611) and CERT Bund (WID-SEC-2025-1988). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • NetApp FAS
  • NetApp AFF
  • NetApp ActiveIQ Unified Manager
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • Microsoft Azure
  • Dell Secure Connect Gateway
  • IBM QRadar SIEM
  • IBM Security Verify Access
  • 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: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
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: Null pointer dereference
CWE: CWE-476 / CWE-404
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: 261611
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-39675

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.190/6.1.149/6.6.103/6.12.44/6.16.4/6.17-rc3
Patch: 2af45aadb7b5d3852c76e2d1e985289ada6f48bf/ee0373b20bb67b1f00a1b25ccd24c8ac996b6446/857b8387a9777e42b36e0400be99b54c251eaf9a/97fc94c5fd3c6ac5a13e457d38ee247737b8c4bd/2ee86b764c54e0d6a5464fb023b630fdf20869cd/7a2ca2ea64b1b63c8baa94a8f5deb70b2248d119

Timelineinfo

04/16/2025 CVE reserved
09/05/2025 +142 days Advisory disclosed
09/05/2025 +0 days VulDB entry created
02/09/2026 +157 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39675 (🔒)
GCVE (CVE): GCVE-0-2025-39675
GCVE (VulDB): GCVE-100-322879
CERT Bund: WID-SEC-2025-1988 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 09/05/2025 21:41
Updated: 02/09/2026 11:22
Changes: 09/05/2025 21:41 (58), 09/07/2025 12:18 (2), 09/09/2025 08:23 (7), 11/06/2025 15:58 (1), 11/25/2025 15:05 (1), 11/27/2025 14:46 (1), 12/29/2025 11:03 (1), 01/05/2026 10:32 (1), 01/08/2026 05:05 (10), 02/09/2026 11:22 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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