CVE-2025-37832: 
Linux Debian vulnerability analysis and mitigation

CVE-2025-37832 is a vulnerability discovered in the Linux kernel's sun50i cpufreq driver that involves an out-of-bounds access issue when handling the nvmem cell. The vulnerability was identified in 2025 and affects systems using the sun50i cpufreq driver (Tenable).

The vulnerability occurs due to a mismatch between the Device Tree (DT) specification and the data access method. While the DT specifies the nvmem cell as covering only two bytes, the driver uses a u32 pointer to read four bytes, resulting in an out-of-bounds access. This issue was detected by KASAN (Kernel Address Sanitizer) enabled kernels, which report the out-of-bounds access in the sun50icpufreqnvmem_probe function (Tenable).

The vulnerability allows for out-of-bounds memory access in the kernel space, which could potentially lead to system instability or crashes. When triggered, the issue can cause kernel panic conditions with the error message 'Non-resumable error' (Tenable).

The fix involves modifying the driver to use nvmemcellread() to return the length of the nvmem cell in bytes and implementing proper data handling. The solution includes using memcpy() to copy the information into a zeroed u32 buffer and ensuring the data is always read in little-endian format, as this matches the storage format in the SID efuses (Tenable).