5.5

CVE-2024-43893: linux Divide By Zero

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2024-43893DEBIAN-CVE-2024-43893
Published 26-08-2024Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2024-43893 is a medium (CVSS 5.5) Divide By Zero vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.26%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 37 · Related 33
DLA-3912-1DLA-4008-1MGASA-2024-0309MGASA-2024-0310SUSE-SU-2024:3189-1SUSE-SU-2024:3190-1

Timeline

  1. 26-08-2024
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

0.00 pp

From 0.26% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.26%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu129 products
  • linuxAll versions (No fix recorded) | < 4.4.0-266.300 | < 4.15.0-235.247 | < 5.4.0-200.220 | < 5.15.0-125.135 | < 6.8.0-50.51
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1141.147 | < 4.4.0-1179.194 | < 4.15.0-1178.191 | < 5.4.0-1135.145 | < 5.15.0-1072.78 | < 6.8.0-1020.22
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bba | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 55b2a5d331a6ceb1c4372945fdb77181265ba24f | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 52b138f1021113e593ee6ad258ce08fe90693a9e | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9196e42a3b8eeff1707e6ef769112b4b6096be49 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e13ba3fe5ee070f8a9dab60029d52b1f61da5051 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e3ad503876283ac3fcca922a1bf243ef9eb0b0e2 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 68dc02f319b9ee54dc23caba742a5c754d1cccc8 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6eabce6608d6f3440f4c03aa3d3ef50a47a3d193 | 2.6.12
  • linux_kernel< 4.19.320 | ≥ 4.20, < 5.4.282 | ≥ 5.5, < 5.10.224 | ≥ 5.11, < 5.15.165 | ≥ 5.16, < 6.1.105 | ≥ 6.2, < 6.6.46 | ≥ 6.7, < 6.10.5 | 6.11:rc1 | 6.11:rc2
Debian1 product
  • linux< 6.1.106-1 | < 6.10.6-1

3 vendors · 132 products

References

40 links
Show all 40 references