CVE-2021-27363: Debian Linux

Medium severity, CVSS 4.4. EPSS: 0.7% chance of exploitation in the next 30 days.

An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer leak can be used to determine the address of the iscsi_transport structure. When an iSCSI transport is registered with the iSCSI subsystem, the transport's handle is available to unprivileged users via the sysfs file system, at /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When read, the show_transport_handle function (in drivers/scsi/scsi_transport_iscsi.c) is called, which leaks the handle. This handle is actually the pointer to an iscsi_transport struct in the kernel module's global variables.

Affected products

• Debian Debian Linux: version 9.0 only
• Linux Linux Kernel: up to and including 5.11.3
• Netapp Cloud Backup: affected versions not specified
• Netapp Solidfire Baseboard Management Controller Firmware: affected versions not specified

Published 2021-03-07. Last modified 2026-06-17.