CVE-2021-0342

Description

In tun_get_user of tun.c, there is possible memory corruption due to a use after free. This could lead to local escalation of privilege with System execution privileges required. User interaction is not required for exploitation. Product: Android; Versions: Android kernel; Android ID: A-146554327.

CVSS Metrics

• v3.1•MEDIUM•Score: 6.7CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
• v2.0•MEDIUM•Score: 4.6AV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.17%• Percentile: 7%

Techniques & Countermeasures

• CWE-416•Use After Free

  The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

• debian•linux

  < 5.7.6-1 | < 5.7.6-1 | < 5.7.6-1 | < 5.7.6-1

• ubuntu•linux

  < 4.15.0-115.116 | < 5.4.0-45.49

• ubuntu•linux-aws

  < 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

  all

• ubuntu•linux-azure-fips

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

• ubuntu•linux-bluefield

  all

• ubuntu•linux-fips

  < 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

  all

• ubuntu•linux-gke-4.15

  < 4.15.0-1067.70

• ubuntu•linux-gke-5.0

  < 5.0.0-1045.46

• ubuntu•linux-gke-5.3

  < 5.3.0-1032.34~18.04.1

• 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

  < 4.15.0-1072.73 | < 5.4.0-1021.21

• ubuntu•linux-oem

  all

• ubuntu•linux-oem-5.6

  < 5.6.0-1020.20

• ubuntu•linux-oem-osp1

  < 5.0.0-1065.70

• 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

  < 4.15.0-1068.72 | all

• ubuntu•linux-raspi2-5.3

  < 5.3.0-1030.32~18.04.2

• ubuntu•linux-realtime

  all

• ubuntu•linux-riscv

  all | all

• ubuntu•linux-snapdragon

  < 4.15.0-1084.92

• google•android

  na

References (5)

• https://source.android.com/security/bulletin/pixel/2021-01-01
• https://ubuntu.com/security/CVE-2021-0342
• https://git.kernel.org/linus/96aa1b22bd6bb9fccf62f6261f390ed6f3e7967f
• https://www.cve.org/CVERecord?id=CVE-2021-0342
• https://security-tracker.debian.org/tracker/CVE-2021-0342