Guest can force Linux netback driver to hog large amounts of kernel memory T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Incoming data packets for a guest in the Linux kernel's netback driver are buffered until the guest is ready to process them. There are some measures taken for avoiding to pile up too much data, but those can be bypassed by the guest: There is a timeout how long the client side of an interface can stop consuming new packets before it is assumed to have stalled, but this timeout is rather long (60 seconds by default). Using a UDP connection on a fast interface can easily accumulate gigabytes of data in that time. (CVE-2021-28715) The timeout could even never trigger if the guest manages to have only one free slot in its RX queue ring page and the next package would require more than one free slot, which may be the case when using GSO, XDP, or software hashing. (CVE-2021-28714)
Image SLES15-SP2-Manager-4-1-Proxy-BYOS-Azure Image SLES15-SP2-Manager-4-1-Proxy-BYOS-EC2-HVM Image SLES15-SP2-Manager-4-1-Proxy-BYOS-GCE Image SLES15-SP2-Manager-4-1-Server-BYOS-Azure Image SLES15-SP2-Manager-4-1-Server-BYOS-EC2-HVM Image SLES15-SP2-Manager-4-1-Server-BYOS-GCE Image SLES15-SP3-Manager-4-2-Proxy-BYOS-Azure Image SLES15-SP3-Manager-4-2-Proxy-BYOS-EC2-HVM Image SLES15-SP3-Manager-4-2-Proxy-BYOS-GCE Image SLES15-SP3-Manager-4-2-Server-BYOS-Azure Image SLES15-SP3-Manager-4-2-Server-BYOS-EC2-HVM Image SLES15-SP3-Manager-4-2-Server-BYOS-GCE openSUSE Leap 15.3 openSUSE Leap 15.4 SUSE CaaS Platform 4.0 SUSE Enterprise Storage 7 SUSE Linux Enterprise Desktop 12 SP5 SUSE Linux Enterprise Desktop 15 SP2 SUSE Linux Enterprise Desktop 15 SP3 SUSE Linux Enterprise Desktop 15 SP4 SUSE Linux Enterprise Desktop 15 SP5 SUSE Linux Enterprise High Availability 12 SP4 SUSE Linux Enterprise High Availability 12 SP5 SUSE Linux Enterprise High Availability 15 SP1 SUSE Linux Enterprise High Availability 15 SP2 SUSE Linux Enterprise High Availability 15 SP3 SUSE Linux Enterprise High Performance Computing 12 SP4 SUSE Linux Enterprise High Performance Computing 12 SP5 SUSE Linux Enterprise High Performance Computing 15 SP1 SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS SUSE Linux Enterprise High Performance Computing 15 SP2 SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS SUSE Linux Enterprise High Performance Computing 15 SP3 SUSE Linux Enterprise High Performance Computing 15 SP4 SUSE Linux Enterprise High Performance Computing 15 SP5 SUSE Linux Enterprise Live Patching 12 SP4 SUSE Linux Enterprise Live Patching 12 SP5 SUSE Linux Enterprise Micro 5.0 SUSE Linux Enterprise Micro 5.1 SUSE Linux Enterprise Micro 5.2 SUSE Linux Enterprise Module for Basesystem 15 SP2 SUSE Linux Enterprise Module for Basesystem 15 SP3 SUSE Linux Enterprise Module for Basesystem 15 SP4 SUSE Linux Enterprise Module for Basesystem 15 SP5 SUSE Linux Enterprise Module for Development Tools 15 SP2 SUSE Linux Enterprise Module for Development Tools 15 SP3 SUSE Linux Enterprise Module for Development Tools 15 SP4 SUSE Linux Enterprise Module for Development Tools 15 SP5 SUSE Linux Enterprise Module for Legacy 15 SP3 SUSE Linux Enterprise Module for Legacy 15 SP4 SUSE Linux Enterprise Module for Legacy 15 SP5 SUSE Linux Enterprise Module for Live Patching 15 SP1 SUSE Linux Enterprise Module for Live Patching 15 SP2 SUSE Linux Enterprise Module for Live Patching 15 SP3 SUSE Linux Enterprise Module for Public Cloud 15 SP3 SUSE Linux Enterprise Module for Public Cloud 15 SP4 SUSE Linux Enterprise Module for Realtime packages 15 SP2 SUSE Linux Enterprise Module for Realtime packages 15 SP3 SUSE Linux Enterprise Real Time 15 SP2 SUSE Linux Enterprise Real Time 15 SP3 SUSE Linux Enterprise Real Time Extension 12 SP5 SUSE Linux Enterprise Server 11 SP3 SUSE Linux Enterprise Server 12 SP2-BCL SUSE Linux Enterprise Server 12 SP3 SUSE Linux Enterprise Server 12 SP3-BCL SUSE Linux Enterprise Server 12 SP3-ESPOS SUSE Linux Enterprise Server 12 SP3-LTSS SUSE Linux Enterprise Server 12 SP3-TERADATA SUSE Linux Enterprise Server 12 SP4 SUSE Linux Enterprise Server 12 SP4-ESPOS SUSE Linux Enterprise Server 12 SP4-LTSS SUSE Linux Enterprise Server 12 SP5 SUSE Linux Enterprise Server 15 SP1 SUSE Linux Enterprise Server 15 SP1-BCL SUSE Linux Enterprise Server 15 SP1-LTSS SUSE Linux Enterprise Server 15 SP2 SUSE Linux Enterprise Server 15 SP2-BCL SUSE Linux Enterprise Server 15 SP2-LTSS SUSE Linux Enterprise Server 15 SP3 SUSE Linux Enterprise Server 15 SP4 SUSE Linux Enterprise Server 15 SP5 SUSE Linux Enterprise Server for SAP Applications 12 SP3 SUSE Linux Enterprise Server for SAP Applications 12 SP4 SUSE Linux Enterprise Server for SAP Applications 12 SP5 SUSE Linux Enterprise Server for SAP Applications 15 SP1 SUSE Linux Enterprise Server for SAP Applications 15 SP2 SUSE Linux Enterprise Server for SAP Applications 15 SP3 SUSE Linux Enterprise Server for SAP Applications 15 SP4 SUSE Linux Enterprise Server for SAP Applications 15 SP5 SUSE Linux Enterprise Software Development Kit 12 SP5 SUSE Linux Enterprise Storage 7 SUSE Linux Enterprise Storage 7.1 SUSE Linux Enterprise Workstation Extension 12 SP5 SUSE Linux Enterprise Workstation Extension 15 SP3 SUSE Linux Enterprise Workstation Extension 15 SP4 SUSE Manager Proxy 4.0 SUSE Manager Proxy 4.1 SUSE Manager Proxy 4.2 SUSE Manager Proxy 4.3 SUSE Manager Retail Branch Server 4.0 SUSE Manager Retail Branch Server 4.1 SUSE Manager Retail Branch Server 4.2 SUSE Manager Retail Branch Server 4.3 SUSE Manager Server 4.0 SUSE Manager Server 4.1 SUSE Manager Server 4.2 SUSE Manager Server 4.3 SUSE OpenStack Cloud 8 SUSE OpenStack Cloud 9 SUSE OpenStack Cloud Crowbar 8 SUSE OpenStack Cloud Crowbar 9