CVE-2021-28038

Name: CVE-2021-28038
Creator: NVD / NIST
Published: 2021-03-05T18:15:13.127+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.71%

Last modified Jun 17, 2026

CVE-2021-28038 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An issue was discovered in the Linux kernel through 5.11.3, as used with Xen PV. A certain part of the netback driver lacks necessary treatment of errors such as failed memory allocations (as a result of changes to the handling of grant mapping errors). EPSS estimates a 0.71% chance of exploitation in the next 30 days.

Description

An issue was discovered in the Linux kernel through 5.11.3, as used with Xen PV. A certain part of the netback driver lacks necessary treatment of errors such as failed memory allocations (as a result of changes to the handling of grant mapping errors). A host OS denial of service may occur during misbehavior of a networking frontend driver. NOTE: this issue exists because of an incomplete fix for CVE-2021-26931.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.71%

48.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions	Update
Linux	Linux Kernel	>= 2.6.39, < 4.4.260	—
Linux	Linux Kernel	>= 4.5.0, < 4.9.260	—
Linux	Linux Kernel	>= 4.10.0, < 4.14.224	—
Linux	Linux Kernel	>= 4.15.0, < 4.19.179	—
Linux	Linux Kernel	>= 4.20.0, < 5.4.103	—
Linux	Linux Kernel	>= 5.10.0, < 5.10.21	—
Linux	Linux Kernel	>= 5.11.0, < 5.11.4	—
Linux	Linux Kernel	5.12	Rc1
Debian	Debian Linux	9.0	—
Netapp	Cloud Backup	All versions	—
Netapp	Solidfire Baseboard Management Controller Firmware	All versions	—

References

http://www.openwall.com/lists/oss-security/2021/03/05/1Mailing List, Patch, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-367.htmlPatch, Vendor Advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2991397d23ec597405b116d96de3813420bdcbc3
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.htmlThird Party Advisory
https://security.netapp.com/advisory/ntap-20210409-0001/Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/03/05/1Mailing List, Patch, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-367.htmlPatch, Vendor Advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2991397d23ec597405b116d96de3813420bdcbc3
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.htmlThird Party Advisory
https://security.netapp.com/advisory/ntap-20210409-0001/Third Party Advisory

Timeline

Published: Mar 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28038?

How severe is CVE-2021-28038?

CVE-2021-28038 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.71% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28038?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28038?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST