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

Severity

 Recommended
high

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.06% (28th percentile)

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  • Snyk ID SNYK-CENTOS8-KERNELRT-2091877
  • published 26 Jul 2021
  • disclosed 5 Mar 2021
Report a new vulnerability Found a mistake?

Introduced: 5 Mar 2021

CVE-2021-27363 Open this link in a new tab
CWE-200 Open this link in a new tab

How to fix?

Upgrade Centos:8 kernel-rt to version 0:4.18.0-240.22.1.rt7.77.el8_3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by Centos. See How to fix? for Centos: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
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NVD

4.4 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    Low
  • Integrity (I)
    None
  • Availability (A)
    Low
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Red Hat

4.4 medium
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SUSE

7.1 high