CVE-2023-54255
Published Dec 30, 2025
Modified Apr 15, 2026
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.
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References
Other 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
Frequently Asked Questions
What is CVE-2023-54255? +
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.
How do I check if I'm vulnerable to CVE-2023-54255? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.