CVE-2021-27365: Debian Linux

High severity, CVSS 7.8. EPSS: 2.1% chance of exploitation in the next 30 days.

An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. An unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a Netlink message.

Affected products

• 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.