What is CVE-2021-28039?

CVE-2021-28039 is a medium-severity vulnerability in Linux Kernel, classified under Incorrect Calculation of Buffer Size. CVSS score: 6.5/10. Published 2021-03-05.

How severe is CVE-2021-28039?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Linux Kernel

CVE-2021-28039

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.

EPSS: 0.004 (34.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.

Affected products

Linux Linux_kernel
Netapp Cloud_backup
Netapp Solidfire_baseboard_management_controller_firmware
Xen
N/a — versions n/a

Weakness classification (CWE)

CWE-131 — Incorrect Calculation of Buffer Size

References

cve@mitre.org (Patch, Vendor Advisory)
cve@mitre.org (mailing-list, Patch, Mailing List, Third Party Advisory)
cve@mitre.org (Third Party Advisory)
cve@mitre.org

Frequently asked questions

What is CVE-2021-28039?: CVE-2021-28039 is a medium-severity vulnerability in Linux Kernel, classified under Incorrect Calculation of Buffer Size. CVSS score: 6.5/10. Published 2021-03-05.
How severe is CVE-2021-28039?: Medium severity. CVSS v3 base score is 6.5 out of 10.