CVE-2024-40970
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk21th percentile - higher than 21% of all known CVEs
Summary
In the Linux kernel, the dw-axi-dmac driver has a vulnerability that overruns the hw_desc array when the number of descriptors exceeds allocated memory, potentially causing a kernel panic. The fix adds a new field to track allocated descriptors and removes an unnecessary call.
Risk Assessment
An attacker could trigger a kernel panic by causing a specific DMA configuration, leading to system unavailability.
Recommendation
Apply the Linux kernel update that includes the fix for CVE-2024-40970.
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Original NVD description (English source)
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).