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CVE-2023-54255: sh: dma: Fix DMA channel offset calculation

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-30 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: sh: dma: Fix DMA channel offset calculation Various SoCs of the SH3, SH4 and SH4A family, which use this driver, feature a differing number of DMA channels, which can be distributed between up to two DMAC modules. The existing implementation fails to correctly accommodate for all those variations, resulting in wrong channel offset calculations and leading to kernel panics. Rewrite dma_base_addr() in order to properly calculate channel offsets in a DMAC module. Fix dmaor_read_reg() and dmaor_write_reg(), so that the correct DMAC module base is selected for the DMAOR register.

Affected products

• Linux kernel: 3.5 — fixed in 6.5

How to fix

Upgrade to a fixed version: Linux kernel 6.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/196f6c71905aa384c0177acf194a1144d480333b
• https://git.kernel.org/stable/c/479380acfa63247b5ac62476138f847aefc62692
• https://git.kernel.org/stable/c/4989627157735c1f1619f08e5bc1592418e7c878
• https://git.kernel.org/stable/c/8fb11fa4805699c6b73a9c8a9d45807f9874abe3
• https://git.kernel.org/stable/c/bca700b48c72f4ffeee977a2ed0eb4a6b4b7b8ad
• https://git.kernel.org/stable/c/d1c946552af299f4fa85bf7da15e328123771128
• https://git.kernel.org/stable/c/e82e47584847129a20b8c9f4a1dcde09374fb0e0
• https://git.kernel.org/stable/c/e9e33faea104381bac80ac79328f0540fc2969f2

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