CVE-2021-27363 Affecting kernel-debuginfo package, versions <0:4.14.225-121.357.amzn1


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.06% (28th percentile)

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  • Snyk IDSNYK-AMZN201803-KERNELDEBUGINFO-1725543
  • published27 Sept 2021
  • disclosed7 Mar 2021

Introduced: 7 Mar 2021

CVE-2021-27363  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2018.03 kernel-debuginfo to version 0:4.14.225-121.357.amzn1 or higher.
This issue was patched in ALAS-2021-1487.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-debuginfo package and not the kernel-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2018.03 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