CVE-2021-27363: An issue was discovered in the Linux kernel through 5.11.3

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.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

Attack vector

Local

Complexity

Low

Privileges

Low

User interaction

None

Confidentiality

Low

Integrity

None

Availability

Low

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.7% · higher than 53% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

KE

Kernel · Linux

through 5.11.3 · source: NVD

CB

Cloud Backup · Netapp

All versions, or not specified · source: NVD

DL

Debian Linux · Debian

9.0 · source: NVD

SB

Solidfire Baseboard Management Controller Firmware · Netapp

All versions, or not specified · source: NVD