2025-12-24 10:32:43
Linux
PUBLISHED
In the Linux kernel, the following vulnerability has been resolved: spi: ch341: fix out-of-bounds memory access in ch341_transfer_one Discovered by Atuin - Automated Vulnerability Discovery Engine. The len variable is calculated as min(32, trans->len + 1), which includes the 1-byte command header. When copying data from trans->tx_buf to ch341->tx_buf + 1, using len as the length is incorrect because: 1. It causes an out-of-bounds read from trans->tx_buf (which has size trans->len, i.e., len - 1 in this context). 2. It can cause an out-of-bounds write to ch341->tx_buf if len is CH341_PACKET_LENGTH (32). Writing 32 bytes to ch341->tx_buf + 1 overflows the buffer. Fix this by copying len - 1 bytes.