{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-43893",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-43893"
  ],
  "published": "2024-08-26T10:22:19Z",
  "summary": "serial: core: check uartclk for zero to avoid divide by zero",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: core: check uartclk for zero to avoid divide by zero\n\nCalling ioctl TIOCSSERIAL with an invalid baud_base can\nresult in uartclk being zero, which will result in a\ndivide by zero error in uart_get_divisor(). The check for\nuartclk being zero in uart_set_info() needs to be done\nbefore other settings are made as subsequent calls to\nioctl TIOCSSERIAL for the same port would be impacted if\nthe uartclk check was done where uartclk gets set.\n\nOops: divide error: 0000  PREEMPT SMP KASAN PTI\nRIP: 0010:uart_get_divisor (drivers/tty/serial/serial_core.c:580)\nCall Trace:\n <TASK>\nserial8250_get_divisor (drivers/tty/serial/8250/8250_port.c:2576\n    drivers/tty/serial/8250/8250_port.c:2589)\nserial8250_do_set_termios (drivers/tty/serial/8250/8250_port.c:502\n    drivers/tty/serial/8250/8250_port.c:2741)\nserial8250_set_termios (drivers/tty/serial/8250/8250_port.c:2862)\nuart_change_line_settings (./include/linux/spinlock.h:376\n    ./include/linux/serial_core.h:608 drivers/tty/serial/serial_core.c:222)\nuart_port_startup (drivers/tty/serial/serial_core.c:342)\nuart_startup (drivers/tty/serial/serial_core.c:368)\nuart_set_info (drivers/tty/serial/serial_core.c:1034)\nuart_set_info_user (drivers/tty/serial/serial_core.c:1059)\ntty_set_serial (drivers/tty/tty_io.c:2637)\ntty_ioctl (drivers/tty/tty_io.c:2647 drivers/tty/tty_io.c:2791)\n__x64_sys_ioctl (fs/ioctl.c:52 fs/ioctl.c:907\n    fs/ioctl.c:893 fs/ioctl.c:893)\ndo_syscall_64 (arch/x86/entry/common.c:52\n    (discriminator 1) arch/x86/entry/common.c:83 (discriminator 1))\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nRule: add",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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        "1:6.1.58-1+rpt2",
        "1:6.1.63-1+rpt1",
        "1:6.1.73-1+rpt1",
        "1:6.6.20-1+rpt1",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-43893"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bba"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/55b2a5d331a6ceb1c4372945fdb77181265ba24f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/52b138f1021113e593ee6ad258ce08fe90693a9e"
    },
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      "url": "https://git.kernel.org/stable/c/9196e42a3b8eeff1707e6ef769112b4b6096be49"
    },
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    },
    {
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      "url": "https://git.kernel.org/stable/c/e3ad503876283ac3fcca922a1bf243ef9eb0b0e2"
    },
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      "url": "https://git.kernel.org/stable/c/68dc02f319b9ee54dc23caba742a5c754d1cccc8"
    },
    {
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      "url": "https://git.kernel.org/stable/c/6eabce6608d6f3440f4c03aa3d3ef50a47a3d193"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}