CVE-2021-27363 Information disclosure in n/a

What is CVE-2021-27363?

CVE-2021-27363 is a medium-severity vulnerability in Debian Debian Linux, published on 7 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Which versions are affected by CVE-2021-27363?

It affects 4 products.

Products include Debian Debian Linux, Linux kernel, Netapp Cloud Backup, Netapp Solidfire Baseboard Management Controller Firmware.

How do I fix CVE-2021-27363?

Apply the vendor's patch.

Is CVE-2021-27363 being exploited?

There is no known exploitation of CVE-2021-27363 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-6532, DEBIAN-CVE-2021-27363, GHSA-ghrr-3969-mcfp, UBUNTU-CVE-2021-27363.