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CVE PROGRAM SOURCE RECORDUnscored

CVE-2024-43893

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

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Status
Published
Published
Updated
Assigning organization
Linux

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

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

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bbaaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 55b2a5d331a6ceb1c4372945fdb77181265ba24faffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 52b138f1021113e593ee6ad258ce08fe90693a9eaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 9196e42a3b8eeff1707e6ef769112b4b6096be49affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < e13ba3fe5ee070f8a9dab60029d52b1f61da5051affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < e3ad503876283ac3fcca922a1bf243ef9eb0b0e2affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 68dc02f319b9ee54dc23caba742a5c754d1cccc8affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6eabce6608d6f3440f4c03aa3d3ef50a47a3d193affected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 4.19.320 to ≤ 4.19.*unaffected
  • 5.4.282 to ≤ 5.4.*unaffected
  • 5.10.224 to ≤ 5.10.*unaffected
  • 5.15.165 to ≤ 5.15.*unaffected
  • 6.1.105 to ≤ 6.1.*unaffected
  • 6.6.46 to ≤ 6.6.*unaffected
  • 6.10.5 to ≤ 6.10.*unaffected
  • 6.11 to ≤ *unaffected

References