Information Exposure Affecting kernel-rt-debug package, versions <0:4.18.0-240.22.1.rt7.77.el8_3


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.06% (28th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELRTDEBUG-1467092
  • published26 Jul 2021
  • disclosed5 Mar 2021

Introduced: 5 Mar 2021

CVE-2021-27363  (opens in a new tab)
CWE-200  (opens in a new tab)

How to fix?

Upgrade RHEL:8 kernel-rt-debug to version 0:4.18.0-240.22.1.rt7.77.el8_3 or higher.
This issue was patched in RHSA-2021:1081.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug package and not the kernel-rt-debug package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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 Scores

version 3.1