Bug 2419836 (CVE-2023-53755)

Summary: CVE-2023-53755 kernel: dmaengine: ptdma: check for null desc before calling pt_cmd_callback
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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AMD PTDMA (Pass-Through DMA) engine crashes the kernel when pt_issue_pending() encounters empty descriptor queues. The function blindly invokes pt_cmd_callback() without verifying that a valid descriptor exists, triggering a NULL pointer dereference. This commonly surfaces during system shutdown on AMD platforms after the DMA engine has been active.
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Description OSIDB Bzimport 2025-12-08 07:02:16 UTC 
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.
Comment 1 Alexander B 2025-12-10 11:23:29 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120843-CVE-2023-53755-1c4b@gregkh/T