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Debian: CVE-2021-27363: linux, linux-4.19 -- security update

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Debian: CVE-2021-27363: linux, linux-4.19 -- security update

Severity
4
CVSS
(AV:L/AC:L/Au:N/C:P/I:N/A:P)
Published
03/07/2021
Created
03/11/2021
Added
03/10/2021
Modified
04/01/2021

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.

Solution(s)

  • debian-upgrade-linux
  • debian-upgrade-linux-4-19

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