Medium 5.5Published Aug 26, 2024

CVE-2024-43893serial: core: check uartclk for zero to avoid divide by zero

Updated under an hour ago (2026-10-19 11:20 UTC)

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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

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bba; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 55b2a5d331a6ceb1c4372945fdb77181265ba24f; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 52b138f1021113e593ee6ad258ce08fe90693a9e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9196e42a3b8eeff1707e6ef769112b4b6096be49; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before e13ba3fe5ee070f8a9dab60029d52b1f61da5051; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before e3ad503876283ac3fcca922a1bf243ef9eb0b0e2; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 68dc02f319b9ee54dc23caba742a5c754d1cccc8; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 6eabce6608d6f3440f4c03aa3d3ef50a47a3d193	CNA record
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name)	before V3.1	CISA ADP
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name)	all versions not affected	CISA ADP
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name)	before V3.1	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	before V1.1.1	CISA ADP
linux linux_kernel linux:linux_kernel	before 4.19.320; from 4.20 before 5.4.282; from 5.5 before 5.10.224; from 5.11 before 5.15.165; from 5.16 before 6.1.105; from 6.2 before 6.6.46; from 6.7 before 6.10.5; 6.11; and 1 more ranges	NVD

References

https://git.kernel.org/stable/c/3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bbapatch
https://git.kernel.org/stable/c/55b2a5d331a6ceb1c4372945fdb77181265ba24fpatch
https://git.kernel.org/stable/c/52b138f1021113e593ee6ad258ce08fe90693a9epatch
https://git.kernel.org/stable/c/9196e42a3b8eeff1707e6ef769112b4b6096be49patch
https://git.kernel.org/stable/c/e13ba3fe5ee070f8a9dab60029d52b1f61da5051patch
https://git.kernel.org/stable/c/e3ad503876283ac3fcca922a1bf243ef9eb0b0e2patch
https://git.kernel.org/stable/c/68dc02f319b9ee54dc23caba742a5c754d1cccc8patch
https://git.kernel.org/stable/c/6eabce6608d6f3440f4c03aa3d3ef50a47a3d193patch
https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
https://cert-portal.siemens.com/productcert/html/ssa-265688.html
https://cert-portal.siemens.com/productcert/html/ssa-355557.html
https://cert-portal.siemens.com/productcert/html/ssa-613116.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.