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Unrated severityNVD Advisory· Published Jul 12, 2024· Updated Jan 5, 2026

Avoid hw_desc array overrun in dw-axi-dmac

CVE-2024-40970

Description

In the Linux kernel, the following vulnerability has been resolved:

Avoid hw_desc array overrun in dw-axi-dmac

I have a use case where nr_buffers = 3 and in which each descriptor is composed by 3 segments, resulting in the DMA channel descs_allocated to be 9. Since axi_desc_put() handles the hw_desc considering the descs_allocated, this scenario would result in a kernel panic (hw_desc array will be overrun).

To fix this, the proposal is to add a new member to the axi_dma_desc structure, where we keep the number of allocated hw_descs (axi_desc_alloc()) and use it in axi_desc_put() to handle the hw_desc array correctly.

Additionally I propose to remove the axi_chan_start_first_queued() call after completing the transfer, since it was identified that unbalance can occur (started descriptors can be interrupted and transfer ignored due to DMA channel not being enabled).

Affected products

96

Patches

5
333e11bf47fa
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
9004784e8d68
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
e151ae1ee065
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
dd42570018f5
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
7c3bb96a20cd
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

5

News mentions

0

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