UBUNTU-CVE-2019-19037

Description

ext4_empty_dir in fs/ext4/namei.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because ext4_read_dirblock(inode,0,DIRENT_HTREE) can be zero.

CVSS Metrics

• v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected Systems

• ubuntu•linux

  < 4.15.0-88.88

• ubuntu•linux-aws

  < 4.15.0-1060.62

• ubuntu•linux-aws-5.0

  < 5.0.0-1025.28

• ubuntu•linux-aws-hwe

  < 4.15.0-1060.62~16.04.1

• ubuntu•linux-azure

  < 4.15.0-1071.76~14.04.1 | < 4.15.0-1071.76 | < 5.0.0-1032.34

• ubuntu•linux-azure-5.3

  < 5.3.0-1013.14~18.04.1

• ubuntu•linux-azure-edge

  all

• ubuntu•linux-azure-fde

  all

• ubuntu•linux-gcp

  < 4.15.0-1055.59 | < 5.0.0-1031.32

• ubuntu•linux-gcp-5.3

  < 5.3.0-1012.13~18.04.1

• ubuntu•linux-gcp-edge

  all

• ubuntu•linux-gke

  all

• ubuntu•linux-gke-4.15

  < 4.15.0-1052.55

• ubuntu•linux-gke-5.0

  < 5.0.0-1030.31

• ubuntu•linux-gke-5.3

  < 5.3.0-1012.13~18.04.1

• ubuntu•linux-hwe

  < 4.15.0-88.88~16.04.1 | < 5.3.0-40.32~18.04.1

• ubuntu•linux-hwe-edge

  all | all

• ubuntu•linux-intel-iot-realtime

  all

• ubuntu•linux-kvm

  < 4.15.0-1053.53

• ubuntu•linux-oem

  < 4.15.0-1073.83

• ubuntu•linux-oem-osp1

  < 5.0.0-1039.44

• ubuntu•linux-oracle

  < 4.15.0-1033.36~16.04.1 | < 4.15.0-1033.36

• ubuntu•linux-oracle-5.0

  < 5.0.0-1011.16

• ubuntu•linux-raspi-realtime

  all

• ubuntu•linux-raspi2

  < 4.15.0-1055.59 | all

• ubuntu•linux-raspi2-5.3

  < 5.3.0-1018.20~18.04.1

• ubuntu•linux-realtime

  all

• ubuntu•linux-riscv

  all

• ubuntu•linux-snapdragon

  < 4.15.0-1072.79

References (4)

• https://ubuntu.com/security/CVE-2019-19037
• https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19037
• https://lore.kernel.org/linux-ext4/20191202170213.4761-2-jack@suse.cz/
• https://www.cve.org/CVERecord?id=CVE-2019-19037