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Alma Linux: CVE-2021-27363: Important: kernel security, bug fix, and enhancement update (ALSA-2021-1093)

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Alma Linux: CVE-2021-27363: Important: kernel security, bug fix, and enhancement update (ALSA-2021-1093)

Severity
4
CVSS
(AV:L/AC:L/Au:N/C:P/I:N/A:P)
Published
03/07/2021
Created
05/05/2022
Added
05/04/2022
Modified
09/15/2022

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)

  • alma-upgrade-kernel-abi-whitelists
  • alma-upgrade-kernel-tools-libs-devel

References

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