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Vulnerability Change Records for CVE-2024-43893

Change History

New CVE Received from kernel.org 8/26/2024 7:15:04 AM

Action Type Old Value New Value
Added Description

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

serial: core: check uartclk for zero to avoid divide by zero

Calling ioctl TIOCSSERIAL with an invalid baud_base can
result in uartclk being zero, which will result in a
divide by zero error in uart_get_divisor(). The check for
uartclk being zero in uart_set_info() needs to be done
before other settings are made as subsequent calls to
ioctl TIOCSSERIAL for the same port would be impacted if
the uartclk check was done where uartclk gets set.

Oops: divide error: 0000  PREEMPT SMP KASAN PTI
RIP: 0010:uart_get_divisor (drivers/tty/serial/serial_core.c:580)
Call Trace:
 <TASK>
serial8250_get_divisor (drivers/tty/serial/8250/8250_port.c:2576
    drivers/tty/serial/8250/8250_port.c:2589)
serial8250_do_set_termios (drivers/tty/serial/8250/8250_port.c:502
    drivers/tty/serial/8250/8250_port.c:2741)
serial8250_set_termios (drivers/tty/serial/8250/8250_port.c:2862)
uart_change_line_settings (./include/linux/spinlock.h:376
    ./include/linux/serial_core.h:608 drivers/tty/serial/serial_core.c:222)
uart_port_startup (drivers/tty/serial/serial_core.c:342)
uart_startup (drivers/tty/serial/serial_core.c:368)
uart_set_info (drivers/tty/serial/serial_core.c:1034)
uart_set_info_user (drivers/tty/serial/serial_core.c:1059)
tty_set_serial (drivers/tty/tty_io.c:2637)
tty_ioctl (drivers/tty/tty_io.c:2647 drivers/tty/tty_io.c:2791)
__x64_sys_ioctl (fs/ioctl.c:52 fs/ioctl.c:907
    fs/ioctl.c:893 fs/ioctl.c:893)
do_syscall_64 (arch/x86/entry/common.c:52
    (discriminator 1) arch/x86/entry/common.c:83 (discriminator 1))
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)

Rule: add
Added Reference

								
							
							
						
kernel.org https://git.kernel.org/stable/c/3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bba [No types assigned]
Added Reference

								
							
							
						
kernel.org https://git.kernel.org/stable/c/52b138f1021113e593ee6ad258ce08fe90693a9e [No types assigned]
Added Reference

								
							
							
						
kernel.org https://git.kernel.org/stable/c/55b2a5d331a6ceb1c4372945fdb77181265ba24f [No types assigned]
Added Reference

								
							
							
						
kernel.org https://git.kernel.org/stable/c/68dc02f319b9ee54dc23caba742a5c754d1cccc8 [No types assigned]
Added Reference

								
							
							
						
kernel.org https://git.kernel.org/stable/c/6eabce6608d6f3440f4c03aa3d3ef50a47a3d193 [No types assigned]
Added Reference

								
							
							
						
kernel.org https://git.kernel.org/stable/c/9196e42a3b8eeff1707e6ef769112b4b6096be49 [No types assigned]
Added Reference

								
							
							
						
kernel.org https://git.kernel.org/stable/c/e13ba3fe5ee070f8a9dab60029d52b1f61da5051 [No types assigned]
Added Reference

								
							
							
						
kernel.org https://git.kernel.org/stable/c/e3ad503876283ac3fcca922a1bf243ef9eb0b0e2 [No types assigned]