CVE-2025-39675 drm/amd/display: Add null pointer check in mod_hdcp_hdcp1_create_session()
A null pointer dereference in the AMD display driver can cause a system crash when creating an HDCP session with no active displays.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-39675?
CVE-2025-39675 is a medium-severity vulnerability in Debian Debian Linux, published on 5 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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)
Weakness: CWE-476
Which versions are affected by CVE-2025-39675?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-39675?
Apply the vendor's patch.
Is CVE-2025-39675 being exploited?
There is no known exploitation of CVE-2025-39675 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-67010, BELL-CVE-2025-39675, DEBIAN-CVE-2025-39675, GHSA-wv4m-6p5m-fm53, ROOT-OS-DEBIAN-11-CVE-2025-39675, ROOT-OS-DEBIAN-12-CVE-2025-39675 and 4 more.