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ubuntucveUbuntu.comUB:CVE-2023-52517
HistoryMar 02, 2024 - 12:00 a.m.

CVE-2023-52517

2024-03-0200:00:00
ubuntu.com
ubuntu.com
6
linux kernel
spi sun6i
vulnerability
dma mode
interrupt mode
data corruption

6.3 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.5%

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.

6.3 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.5%