UBUNTU-CVE-2021-27363

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UBUNTU-CVE-2021-27363

Summary:

Details: 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://ubuntu.com/security/CVE-2021-27363, https://git.kernel.org/linus/688e8128b7a92df982709a4137ea4588d16f24aa, http://www.openwall.com/lists/oss-security/2021/03/06/1, https://bugzilla.suse.com/show_bug.cgi?id=1182716, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aa, https://ubuntu.com/security/notices/USN-4883-1, https://ubuntu.com/security/notices/USN-4887-1, https://ubuntu.com/security/notices/USN-4889-1, https://ubuntu.com/security/notices/USN-4901-1, https://www.cve.org/CVERecord?id=CVE-2021-27363