CVE-2024-43893

MEDIUM EPSS 16.7%
Published Aug 26, 20241y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Aug 26, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

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

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
16.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-369

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel* <4.19.320
linuxlinux_kernel*≥4.20  –  <5.4.282
linuxlinux_kernel*≥5.5  –  <5.10.224
linuxlinux_kernel*≥5.11  –  <5.15.165
linuxlinux_kernel*≥5.16  –  <6.1.105
linuxlinux_kernel*≥6.2  –  <6.6.46
linuxlinux_kernel*≥6.7  –  <6.10.5
linuxlinux_kernel6.11any
linuxlinux_kernel6.11any

References 13

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-265688.html
  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-355557.html
  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-613116.html
  • git.kernel.org https://git.kernel.org/stable/c/3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bba
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/52b138f1021113e593ee6ad258ce08fe90693a9e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/55b2a5d331a6ceb1c4372945fdb77181265ba24f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/68dc02f319b9ee54dc23caba742a5c754d1cccc8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6eabce6608d6f3440f4c03aa3d3ef50a47a3d193
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9196e42a3b8eeff1707e6ef769112b4b6096be49
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e13ba3fe5ee070f8a9dab60029d52b1f61da5051
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e3ad503876283ac3fcca922a1bf243ef9eb0b0e2
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bba
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/52b138f1021113e593ee6ad258ce08fe90693a9e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/55b2a5d331a6ceb1c4372945fdb77181265ba24f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/68dc02f319b9ee54dc23caba742a5c754d1cccc8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6eabce6608d6f3440f4c03aa3d3ef50a47a3d193
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9196e42a3b8eeff1707e6ef769112b4b6096be49
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e13ba3fe5ee070f8a9dab60029d52b1f61da5051
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e3ad503876283ac3fcca922a1bf243ef9eb0b0e2
    Patch