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Oracle Linux: CVE-2021-27363: ELSA-2021-9115: Unbreakable Enterprise kernel-container security update (IMPORTANT) (Multiple Advisories)

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Oracle Linux: CVE-2021-27363: ELSA-2021-9115: Unbreakable Enterprise kernel-container security update (IMPORTANT) (Multiple Advisories)

Severity
3
CVSS
(AV:L/AC:L/Au:S/C:P/I:N/A:P)
Published
03/05/2021
Created
03/19/2021
Added
03/18/2021
Modified
07/22/2024

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. A flaw was found in the way access to sessions and handles was handled in the iSCSI driver in the Linux kernel. A local user could use this flaw to leak iSCSI transport handle kernel address or end arbitrary iSCSI connections on the system.

Solution(s)

  • oracle-linux-upgrade-kernel

References

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