CVE-2021-27364: Canonical Ubuntu Linux

High severity, CVSS 7.1. EPSS: 1% chance of exploitation in the next 30 days.

An issue was discovered in the Linux kernel through 5.11.3. drivers/scsi/scsi_transport_iscsi.c is adversely affected by the ability of an unprivileged user to craft Netlink messages.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only; version 20.04 only
• Debian Debian Linux: version 9.0 only
• Linux Linux Kernel: before 4.4.260 (fixed in 4.4.260); from 4.5, before 4.9.260 (fixed in 4.9.260); from 4.10, before 4.14.224 (fixed in 4.14.224); from 4.15, before 4.19.179 (fixed in 4.19.179); from 4.20, before 5.4.103 (fixed in 5.4.103); from 5.5, 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
• Oracle Tekelec Platform Distribution: from 7.4.0, up to and including 7.7.1

Published 2021-03-07. Last modified 2026-07-30.