CVE-2020-15437

Description

The Linux kernel before version 5.8 is vulnerable to a NULL pointer dereference in drivers/tty/serial/8250/8250_core.c:serial8250_isa_init_ports() that allows local users to cause a denial of service by using the p->serial_in pointer which uninitialized.

CVSS Metrics

• v3.1•MEDIUM•Score: 4.4CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
• v2.0•MEDIUM•Score: 4.9AV:L/AC:L/Au:N/C:N/I:N/A:C

EPSS Trends

Current EPSS score: 0.43%• Percentile: 37%

Techniques & Countermeasures

• CWE-476•NULL Pointer Dereference

  The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

• debian•linux

  < 5.7.17-1 | < 5.7.17-1 | < 5.7.17-1 | < 5.7.17-1

• ubuntu•linux

  all | < 4.4.0-189.219 | < 4.15.0-115.116 | < 5.4.0-45.49

• ubuntu•linux-aws

  < 4.4.0-1077.81 | < 4.4.0-1113.126 | < 4.15.0-1080.84 | < 5.4.0-1022.22

• ubuntu•linux-aws-5.0

  all

• ubuntu•linux-aws-5.3

  all

• ubuntu•linux-aws-5.4

  < 5.4.0-1022.22~18.04.1

• ubuntu•linux-aws-fips

  < 4.15.0-2025.25 | all | < 5.4.0-1069.73+fips2

• ubuntu•linux-aws-hwe

  < 4.15.0-1080.84~16.04.1

• ubuntu•linux-azure

  < 4.15.0-1093.103~14.04.1 | < 4.15.0-1093.103~16.04.1 | all | < 5.4.0-1023.23

• ubuntu•linux-azure-4.15

  < 4.15.0-1093.103

• ubuntu•linux-azure-5.3

  all

• ubuntu•linux-azure-5.4

  < 5.4.0-1023.23~18.04.1

• ubuntu•linux-azure-edge

  all

• ubuntu•linux-azure-fde-5.15

  < 5.15.0-1114.123~20.04.1

• ubuntu•linux-azure-fips

  < 4.15.0-2007.8 | all | < 5.4.0-1073.76+fips1

• ubuntu•linux-bluefield

  all

• ubuntu•linux-fips

  < 4.4.0-1045.50 | all | < 4.15.0-1039.44

• ubuntu•linux-gcp

  < 4.15.0-1081.92~16.04.1 | all | < 5.4.0-1022.22

• ubuntu•linux-gcp-4.15

  < 4.15.0-1081.92

• ubuntu•linux-gcp-5.3

  all

• ubuntu•linux-gcp-5.4

  < 5.4.0-1022.22~18.04.1

• ubuntu•linux-gcp-edge

  all

• ubuntu•linux-gcp-fips

  all | < 5.4.0-1067.71~20.04.1

• ubuntu•linux-gke-4.15

  < 4.15.0-1067.70

• ubuntu•linux-hwe

  < 4.15.0-115.116~16.04.1 | all

• ubuntu•linux-hwe-5.4

  < 5.4.0-45.49~18.04.2

• ubuntu•linux-hwe-edge

  all | all

• ubuntu•linux-intel-iot-realtime

  all

• ubuntu•linux-kvm

  < 4.4.0-1079.86 | < 4.15.0-1072.73 | < 5.4.0-1021.21

• ubuntu•linux-lts-xenial

  < 4.4.0-189.219~14.04.1

• ubuntu•linux-oem

  < 4.15.0-1094.104

• ubuntu•linux-oem-5.6

  < 5.6.0-1048.52

• ubuntu•linux-oracle

  < 4.15.0-1051.55~16.04.1 | < 4.15.0-1051.55 | < 5.4.0-1022.22

• ubuntu•linux-oracle-5.0

  all

• ubuntu•linux-oracle-5.3

  all

• ubuntu•linux-oracle-5.4

  < 5.4.0-1022.22~18.04.1

• ubuntu•linux-raspi

  < 5.4.0-1016.17

• ubuntu•linux-raspi-5.4

  < 5.4.0-1016.17~18.04.1

• ubuntu•linux-raspi-realtime

  all

• ubuntu•linux-raspi2

  < 4.4.0-1138.147 | < 4.15.0-1068.72 | all

• ubuntu•linux-realtime

  all

• ubuntu•linux-riscv

  < 5.4.0-31.35

• ubuntu•linux-snapdragon

  < 4.4.0-1142.151 | < 4.15.0-1084.92

• linux•linux_kernel

  < 5.8

References (6)

• https://lkml.org/lkml/2020/7/21/80
• https://ubuntu.com/security/CVE-2020-15437
• https://git.kernel.org/linus/f4c23a140d80ef5e6d3d1f8f57007649014b60fa
• https://ubuntu.com/security/notices/USN-4752-1
• https://www.cve.org/CVERecord?id=CVE-2020-15437
• https://security-tracker.debian.org/tracker/CVE-2020-15437