CVE-2025-68352

In the Linux kernel, the following vulnerability has been resolved:

spi: ch341: fix out-of-bounds memory access in ch341transferone

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->txbuf' to 'ch341->txbuf + 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->txbuf' if 'len' is CH341PACKETLENGTH (32). Writing 32 bytes to ch341->txbuf + 1 overflows the buffer.

Fix this by copying 'len - 1' bytes.