Headline
CVE-2020-35503: NULL pointer dereference issue in megasas-gen2 host bus adapter
A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Description Mauro Matteo Cascella 2020-12-23 14:32:23 UTC
A NULL pointer dereference issue was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU. It could occur in the megasas_command_cancelled() callback function in hw/scsi/megasas.c while dropping a SCSI request. A privileged guest user may exploit this issue to crash the QEMU process on the host, resulting in a denial of service condition.
Comment 1 Mauro Matteo Cascella 2020-12-23 14:32:29 UTC
Acknowledgments:
Name: Cheolwoo Myung
Comment 2 Mauro Matteo Cascella 2020-12-23 15:42:40 UTC
Statement:
This issue does not affect Red Hat Enterprise Linux, Red Hat OpenStack Platform and RHEL Advanced Virtualization, as the `qemu-kvm` package does not include support for the megasas-gen2 host bus adapter emulation.
Comment 3 Mauro Matteo Cascella 2020-12-23 15:43:06 UTC
Created qemu tracking bugs for this issue:
Affects: fedora-all [bug 1910366]
Created xen tracking bugs for this issue:
Affects: fedora-all [bug 1910367]