UBUNTU-CVE-2020-35513

Description

A flaw incorrect umask during file or directory modification in the Linux kernel NFS (network file system) functionality was found in the way user create and delete object using NFSv4.2 or newer if both simultaneously accessing the NFS by the other process that is not using new NFSv4.2. A user with access to the NFS could use this flaw to starve the resources causing denial of service.

CVSS Metrics

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

Affected Systems

• ubuntu•linux

  all | < 4.15.0-23.25

• ubuntu•linux-aws

  all | < 4.15.0-1010.10

• ubuntu•linux-aws-5.0

  all

• ubuntu•linux-aws-5.3

  all

• ubuntu•linux-azure

  all | < 4.15.0-1013.13~16.04.2 | all

• ubuntu•linux-azure-5.3

  all

• ubuntu•linux-azure-edge

  all

• ubuntu•linux-gcp

  < 4.15.0-1014.14~16.04.1 | all

• ubuntu•linux-gcp-5.3

  all

• ubuntu•linux-gcp-edge

  all

• ubuntu•linux-hwe

  < 4.15.0-24.26~16.04.1 | all

• ubuntu•linux-hwe-edge

  all | all

• ubuntu•linux-kvm

  < 4.15.0-1011.11

• ubuntu•linux-lts-xenial

  all

• ubuntu•linux-oem

  all

• ubuntu•linux-oracle-5.0

  all

• ubuntu•linux-oracle-5.3

  all

• ubuntu•linux-raspi2

  < 4.15.0-1012.13 | all

• ubuntu•linux-riscv

  all

References (3)

• https://ubuntu.com/security/CVE-2020-35513
• https://git.kernel.org/linus/880a3a5325489a143269a8e172e7563ebf9897bc
• https://www.cve.org/CVERecord?id=CVE-2020-35513