CVE-2021-28038: Debian Linux

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Debian Debian Linux: version 9.0 only
• Linux Linux Kernel: from 2.6.39, before 4.4.260 (fixed in 4.4.260); from 4.5.0, before 4.9.260 (fixed in 4.9.260); from 4.10.0, before 4.14.224 (fixed in 4.14.224); from 4.15.0, before 4.19.179 (fixed in 4.19.179); from 4.20.0, before 5.4.103 (fixed in 5.4.103); from 5.10.0, before 5.10.21 (fixed in 5.10.21); …
• Netapp Cloud Backup: affected versions not specified
• Netapp Solidfire Baseboard Management Controller Firmware: affected versions not specified

Published 2021-03-05. Last modified 2026-06-17.