Skip to content
CVE PROGRAM SOURCE RECORD7.1 High

CVE-2024-44950

serial: sc16is7xx: fix invalid FIFO access with special register set

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • dfeae619d781dee61666d5551b93ba3be755a86b to < cc6a3f35bc9b3a8da1b195420a2e8d9fdadfa831affected
  • dfeae619d781dee61666d5551b93ba3be755a86b to < dc5ead0e8fc5ef53b8553394d4aab60c277976b3affected
  • dfeae619d781dee61666d5551b93ba3be755a86b to < 6a6730812220a9a5ce4003eb347da1ee5abd06b0affected
  • dfeae619d781dee61666d5551b93ba3be755a86b to < 7d3b793faaab1305994ce568b59d61927235f57baffected

Linux Linux

Default version status: affected

  • 3.16affected
  • 0 to < 3.16unaffected
  • 6.1.120 to ≤ 6.1.*unaffected
  • 6.6.64 to ≤ 6.6.*unaffected
  • 6.10.5 to ≤ 6.10.*unaffected
  • 6.11 to ≤ *unaffected

References