CVE-2021-27363 Affecting torvalds/linux package, versions [,5.11.4)


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.02% (4th percentile)

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  • Snyk IDSNYK-UNMANAGED-TORVALDSLINUX-3004746
  • published26 Jan 2022
  • disclosed7 Mar 2021
  • creditUnknown

Introduced: 7 Mar 2021

CVE-2021-27363  (opens in a new tab)

How to fix?

Upgrade torvalds/linux to version 5.11.4 or higher.

Overview

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.

References

CVSS Base Scores

version 3.1