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Vulnerability record · CVE-2021-28039 · published 5 March 2021

CVE-2021-28039: Linux kernel vulnerability

Linux · Linux Kernel

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.

6.5 CVSS 3.1 Medium EPSS 0.42% · top 65.4% CWE-131 · CWE-131
6.5CVSS 3.1 base score, v2 2.1
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2021-28039), CISA KEV, FIRST EPSS (scores of 2026-10-06). This page is refreshed as NVD updates the record.