Bug 2397564 (CVE-2025-39869)

Summary: CVE-2025-39869 kernel: dmaengine: ti: edma: Fix memory allocation size for queue_priority_map
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-09-23 07:01:57 UTC 
In the Linux kernel, the following vulnerability has been resolved:

dmaengine: ti: edma: Fix memory allocation size for queue_priority_map

Fix a critical memory allocation bug in edma_setup_from_hw() where
queue_priority_map was allocated with insufficient memory. The code
declared queue_priority_map as s8 (*)[2] (pointer to array of 2 s8),
but allocated memory using sizeof(s8) instead of the correct size.

This caused out-of-bounds memory writes when accessing:
  queue_priority_map[i][0] = i;
  queue_priority_map[i][1] = i;

The bug manifested as kernel crashes with "Oops - undefined instruction"
on ARM platforms (BeagleBoard-X15) during EDMA driver probe, as the
memory corruption triggered kernel hardening features on Clang.

Change the allocation to use sizeof(*queue_priority_map) which
automatically gets the correct size for the 2D array structure.
Comment 1 Jon Moroney 2025-09-23 17:20:45 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025092359-CVE-2025-39869-6005@gregkh/T