CVE-2024-43893

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

State: Published
Severity: Not scored
Published: Aug 26, 2024
Updated: Oct 15, 2026
Reserved: Aug 17, 2024

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

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bbaAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 55b2a5d331a6ceb1c4372945fdb77181265ba24fAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 52b138f1021113e593ee6ad258ce08fe90693a9eAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9196e42a3b8eeff1707e6ef769112b4b6096be49Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before e13ba3fe5ee070f8a9dab60029d52b1f61da5051Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before e3ad503876283ac3fcca922a1bf243ef9eb0b0e2Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 68dc02f319b9ee54dc23caba742a5c754d1cccc8Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6eabce6608d6f3440f4c03aa3d3ef50a47a3d193Affected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 4.19.320 through 4.19.Not affected 5.4.282 through 5.4.Not affected 5.10.224 through 5.10.Not affected 5.15.165 through 5.15.Not affected 6.1.105 through 6.1.Not affected 6.6.46 through 6.6.Not affected 6.10.5 through 6.10.*Not affected 6.11 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bbaAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 55b2a5d331a6ceb1c4372945fdb77181265ba24fAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 52b138f1021113e593ee6ad258ce08fe90693a9eAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9196e42a3b8eeff1707e6ef769112b4b6096be49Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before e13ba3fe5ee070f8a9dab60029d52b1f61da5051Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before e3ad503876283ac3fcca922a1bf243ef9eb0b0e2Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 68dc02f319b9ee54dc23caba742a5c754d1cccc8Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6eabce6608d6f3440f4c03aa3d3ef50a47a3d193Affected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
4.19.320 through 4.19.*Not affected
5.4.282 through 5.4.*Not affected
5.10.224 through 5.10.*Not affected
5.15.165 through 5.15.*Not affected
6.1.105 through 6.1.*Not affected
6.6.46 through 6.6.*Not affected
6.10.5 through 6.10.*Not affected
6.11 and laterNot affected

References

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