Detections
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CVE-2021-27363
medium
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.
References
https://security.netapp.com/advisory/ntap-20210409-0001/
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
https://bugzilla.suse.com/show_bug.cgi?id=1182716
https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html
http://www.openwall.com/lists/oss-security/2021/03/06/1
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html