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
• v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.14%• Percentile: 34%

Techniques & Countermeasures

• CWE-131•Incorrect Calculation of Buffer Size

  The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.

Affected Systems

• linux•linux_kernel

  ≥ 5.9.0, ≤ 5.11.3

• netapp•cloud_backup

  na

• netapp•solidfire_baseboard_management_controller_firmware

  na

• xen•xen

  na

References (4)

• http://xenbits.xen.org/xsa/advisory-369.html
• http://www.openwall.com/lists/oss-security/2021/03/05/2
• https://security.netapp.com/advisory/ntap-20210409-0001/
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=882213990d32fd224340a4533f6318dd152be4b2