CVE-2026-43380

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read<br /> <br /> The q54sj108a2_debugfs_read function suffers from a stack buffer overflow<br /> due to incorrect arguments passed to bin2hex(). The function currently<br /> passes &amp;#39;data&amp;#39; as the destination and &amp;#39;data_char&amp;#39; as the source.<br /> <br /> Because bin2hex() converts each input byte into two hex characters, a<br /> 32-byte block read results in 64 bytes of output. Since &amp;#39;data&amp;#39; is only<br /> 34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end<br /> of the buffer onto the stack.<br /> <br /> Additionally, the arguments were swapped: it was reading from the<br /> zero-initialized &amp;#39;data_char&amp;#39; and writing to &amp;#39;data&amp;#39;, resulting in<br /> all-zero output regardless of the actual I2C read.<br /> <br /> Fix this by:<br /> 1. Expanding &amp;#39;data_char&amp;#39; to 66 bytes to safely hold the hex output.<br /> 2. Correcting the bin2hex() argument order and using the actual read count.<br /> 3. Using a pointer to select the correct output buffer for the final<br /> simple_read_from_buffer call.