CVE-2023-52517 spi: sun6i: fix race between DMA RX transfer completion and RX FIFO drain
A race condition in the Linux kernel sun6i SPI driver allows data corruption or system instability during DMA transfers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-52517?
CVE-2023-52517 is a high-severity vulnerability in Linux kernel, published on 2 Mar 2024. 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:
spi: sun6i: fix race between DMA RX transfer completion and RX FIFO drain
Previously the transfer complete IRQ immediately drained to RX FIFO to read any data remaining in FIFO to the RX buffer. This behaviour is correct when dealing with SPI in interrupt mode. However in DMA mode the transfer complete interrupt still fires as soon as all bytes to be transferred have been stored in the FIFO. At that point data in the FIFO still needs to be picked up by the DMA engine. Thus the drain procedure and DMA engine end up racing to read from RX FIFO, corrupting any data read. Additionally the RX buffer pointer is never adjusted according to DMA progress in DMA mode, thus calling the RX FIFO drain procedure in DMA mode is a bug. Fix corruptions in DMA RX mode by draining RX FIFO only in interrupt mode. Also wait for completion of RX DMA when in DMA mode before returning to ensure all data has been copied to the supplied memory buffer.
Weakness: CWE-362
Which versions are affected by CVE-2023-52517?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-52517?
Apply the vendor's patch.
Is CVE-2023-52517 being exploited?
There is no known exploitation of CVE-2023-52517 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-52517, DEBIAN-CVE-2023-52517, GHSA-r867-j6v8-hv77, ROOT-OS-DEBIAN-11-CVE-2023-52517, UBUNTU-CVE-2023-52517.