CVE-2023-53755 dmaengine: ptdma: check for null desc before calling pt_cmd_callback
A null pointer dereference in the AMD PTDMA driver causes a kernel panic during host shutdown, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-53755?
CVE-2023-53755 is a vulnerability in Linux, published on 8 Dec 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:
dmaengine: ptdma: check for null desc before calling pt_cmd_callback
Resolves a panic that can occur on AMD systems, typically during host shutdown, after the PTDMA driver had been exercised. The issue was the pt_issue_pending() function is mistakenly assuming that there will be at least one descriptor in the Submitted queue when the function is called. However, it is possible that both the Submitted and Issued queues could be empty, which could result in pt_cmd_callback() being mistakenly called with a NULL pointer. Ref: Bugzilla Bug 216856.
Which versions are affected by CVE-2023-53755?
How do I fix CVE-2023-53755?
Apply the vendor's patch.
Is CVE-2023-53755 being exploited?
There is no known exploitation of CVE-2023-53755 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-53755, DEBIAN-CVE-2023-53755, GHSA-x28w-7692-rg3v, UBUNTU-CVE-2023-53755.