UBUNTU-CVE-2021-28039

Description

An issue was discovered in the Linux kernel 5.9.x through 5.11.3, as used with Xen. In some less-common configurations, an x86 PV guest OS user can crash a Dom0 or driver domain via a large amount of I/O activity. The issue relates to misuse of guest physical addresses when a configuration has CONFIG_XEN_UNPOPULATED_ALLOC but not CONFIG_XEN_BALLOON_MEMORY_HOTPLUG.

CVSS Metrics

• v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Affected Systems

• ubuntu•linux-aws-5.0

  all

• ubuntu•linux-aws-5.3

  all

• ubuntu•linux-azure

  all

• ubuntu•linux-azure-5.3

  all

• ubuntu•linux-azure-edge

  all

• ubuntu•linux-gcp

  all

• ubuntu•linux-gcp-5.3

  all

• ubuntu•linux-gcp-edge

  all

• ubuntu•linux-gke-4.15

  all

• ubuntu•linux-hwe

  all

• ubuntu•linux-hwe-edge

  all | all

• ubuntu•linux-oem

  all

• ubuntu•linux-oracle-5.0

  all

• ubuntu•linux-oracle-5.3

  all

• ubuntu•linux-raspi2

  all

• ubuntu•linux-riscv

  all

References (5)

• https://ubuntu.com/security/CVE-2021-28039
• https://xenbits.xen.org/xsa/advisory-369.html
• http://www.openwall.com/lists/oss-security/2021/03/05/2
• http://xenbits.xen.org/xsa/advisory-369.html
• https://www.cve.org/CVERecord?id=CVE-2021-28039