Description

In the Linux kernel, the following vulnerability has been resolved: serial: sc16is7xx: fix invalid FIFO access with special register set When enabling access to the special register set, Receiver time-out and RHR interrupts can happen. In this case, the IRQ handler will try to read from the FIFO thru the RHR register at address 0x00, but address 0x00 is mapped to DLL register, resulting in erroneous FIFO reading. Call graph example: sc16is7xx_startup(): entry sc16is7xx_ms_proc(): entry sc16is7xx_set_termios(): entry sc16is7xx_set_baud(): DLH/DLL = $009C --> access special register set sc16is7xx_port_irq() entry --> IIR is 0x0C sc16is7xx_handle_rx() entry sc16is7xx_fifo_read(): --> unable to access FIFO (RHR) because it is mapped to DLL (LCR=LCR_CONF_MODE_A) sc16is7xx_set_baud(): exit --> Restore access to general register set Fix the problem by claiming the efr_lock mutex when accessing the Special register set.

Affected Products 3

References 5

• git.kernel.org https://git.kernel.org/stable/c/6a6730812220a9a5ce4003eb347da1ee5abd06b0
  Patch
• git.kernel.org https://git.kernel.org/stable/c/7d3b793faaab1305994ce568b59d61927235f57b
  Patch
• git.kernel.org https://git.kernel.org/stable/c/cc6a3f35bc9b3a8da1b195420a2e8d9fdadfa831
• git.kernel.org https://git.kernel.org/stable/c/dc5ead0e8fc5ef53b8553394d4aab60c277976b3
• lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html

Remediation

• git.kernel.org https://git.kernel.org/stable/c/6a6730812220a9a5ce4003eb347da1ee5abd06b0
  Patch
• git.kernel.org https://git.kernel.org/stable/c/7d3b793faaab1305994ce568b59d61927235f57b
  Patch