CVE-2020-27821

A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.

A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.

QEMU is a FAST! processor emulator using dynamic translation to achieve good emulation speed. QEMU has two operating modes: Full system emulation. In this mode, QEMU emulates a full system (for example a PC), including one or several processors and various peripherals. It can be used to launch different Operating Systems without rebooting the PC or to debug system code. User mode emulation. In this mode, QEMU can launch processes compiled for one CPU on another CPU. It can be used to launch the Wine Windows API emulator (https://www.winehq.org) or to ease cross-compilation and cross-debugging. You can refer to https://www.qemu.org for more infortmation.\r\n\r\n Security Fix(es):\r\n\r\n A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.(CVE-2020-27821)\r\n\r\n

Kernel-based Virtual Machine (KVM) offers a full virtualization solution for Linux on numerous hardware platforms. The virt:Rocky Linux module contains packages which provide user-space components used to run virtual machines using KVM. The packages also provide APIs for managing and interacting with the virtualized systems.

Security Fix(es):

• libvirt: double free in qemuAgentGetInterfaces() in qemu_agent.c (CVE-2020-25637)

• QEMU: heap buffer overflow in msix_table_mmio_write() in hw/pci/msix.c (CVE-2020-27821)

• QEMU: ide: atapi: OOB access while processing read commands (CVE-2020-29443)

• QEMU: heap buffer overflow in iscsi_aio_ioctl_cb() in block/iscsi.c may lead to information disclosure (CVE-2020-11947)

• QEMU: reachable assertion failure in net_tx_pkt_add_raw_fragment() in hw/net/net_tx_pkt.c (CVE-2020-16092)

• QEMU: infinite loop in e1000e_write_packet_to_guest() in hw/net/e1000e_core.c (CVE-2020-25707)

• QEMU: assertion failure through usb_packet_unmap() in hw/usb/hcd-ehci.c (CVE-2020-25723)

• QEMU: e1000e: infinite loop scenario in case of null packet descriptor (CVE-2020-28916)

• QEMU: slirp: out-of-bounds access while processing ARP/NCSI packets (CVE-2020-29129, CVE-2020-29130)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 8.4 Release Notes linked from the References section.

A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.

Kernel-based Virtual Machine (KVM) offers a full virtualization solution for Linux on numerous hardware platforms. The virt:rhel module contains packages which provide user-space components used to run virtual machines using KVM. The packages also provide APIs for managing and interacting with the virtualized systems.

Security Fix(es):

• libvirt: double free in qemuAgentGetInterfaces() in qemu_agent.c (CVE-2020-25637)

• QEMU: heap buffer overflow in msix_table_mmio_write() in hw/pci/msix.c (CVE-2020-27821)

• QEMU: ide: atapi: OOB access while processing read commands (CVE-2020-29443)

• QEMU: heap buffer overflow in iscsi_aio_ioctl_cb() in block/iscsi.c may lead to information disclosure (CVE-2020-11947)

• QEMU: reachable assertion failure in net_tx_pkt_add_raw_fragment() in hw/net/net_tx_pkt.c (CVE-2020-16092)

• QEMU: infinite loop in e1000e_write_packet_to_guest() in hw/net/e1000e_core.c (CVE-2020-25707)

• QEMU: assertion failure through usb_packet_unmap() in hw/usb/hcd-ehci.c (CVE-2020-25723)

• QEMU: e1000e: infinite loop scenario in case of null packet descriptor (CVE-2020-28916)

• QEMU: slirp: out-of-bounds access while processing ARP/NCSI packets (CVE-2020-29129, CVE-2020-29130)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

This update for qemu fixes the following issues:

• CVE-2020-12829: Fix OOB access in sm501 device emulation (bsc#1172385)
• CVE-2020-25723: Fix use-after-free in usb xhci packet handling (bsc#1178934)
• CVE-2020-25084: Fix use-after-free in usb ehci packet handling (bsc#1176673)
• CVE-2020-25625: Fix infinite loop (DoS) in usb hcd-ohci emulation (bsc#1176684)
• CVE-2020-25624: Fix OOB access in usb hcd-ohci emulation (bsc#1176682)
• CVE-2020-27617: Fix guest triggerable assert in shared network handling code (bsc#1178174)
• CVE-2020-28916: Fix infinite loop (DoS) in e1000e device emulation (bsc#1179468)
• CVE-2020-29443: Fix OOB access in atapi emulation (bsc#1181108)
• CVE-2020-27821: Fix heap overflow in MSIx emulation (bsc#1179686)
• CVE-2020-15469: Fix null pointer deref. (DoS) in mmio ops (bsc#1173612)
• CVE-2021-20257: Fix infinite loop (DoS) in e1000 device emulation (bsc#1182577)
• CVE-2021-3416: Fix OOB access (stack overflow) in rtl8139 NIC emulation (bsc#1182968)
• CVE-2021-3416: Fix OOB access (stack overflow) in other NIC emulations (bsc#1182968)
• CVE-2020-27616: Fix OOB access in ati-vga emulation (bsc#1178400)
• CVE-2020-29129: Fix OOB access in SLIRP ARP/NCSI packet processing (bsc#1179466, CVE-2020-29130, bsc#1179467)
• Fix package scripts to not use hard coded paths for temporary working directories and log files (bsc#1182425)
• Add split-provides through forsplits/13 to cover updates of SLE15-SP2 to SLE15-SP3, and openSUSE equivalents (bsc#1184064)
• Added a few more usability improvements for our git packaging workflow

This update was imported from the SUSE:SLE-15-SP2:Update update project.

This update for qemu fixes the following issues:

• Switch method of splitting off hw-s390x-virtio-gpu-ccw.so as a module to what was accepted upstream (bsc#1181103)
• Fix OOB access in sdhci interface (CVE-2020-17380, bsc#1175144, CVE-2020-25085, bsc#1176681, CVE-2021-3409, bsc#1182282)
• Fix potential privilege escalation in virtiofsd tool (CVE-2021-20263, bsc#1183373)
• Fix OOB access (stack overflow) in rtl8139 NIC emulation (CVE-2021-3416, bsc#1182968)
• Fix heap overflow in MSIx emulation (CVE-2020-27821, bsc#1179686)
• Fix package scripts to not use hard coded paths for temporary working directories and log files (bsc#1182425)
• QEMU BIOS fails to read stage2 loader on s390x (bsc#1186290)
• For the record, these issues are fixed in this package already. Most are alternate references to previously mentioned issues: (CVE-2019-15890, bsc#1149813, CVE-2020-8608, bsc#1163019, CVE-2020-14364, bsc#1175534, CVE-2020-25707, bsc#1178683, CVE-2020-25723, bsc#1178935, CVE-2020-29130, bsc#1179477, CVE-2020-29129, bsc#1179484, CVE-2021-3419, bsc#1182975)

These are all security issues fixed in the qemu-6.1.0-32.1 package on the GA media of openSUSE Tumbleweed.

This update for qemu fixes the following issues:

• Fix OOB access in sm501 device emulation (CVE-2020-12829, bsc#1172385)
• Fix OOB access possibility in MegaRAID SAS 8708EM2 emulation (CVE-2020-13362 bsc#1172383)
• Fix use-after-free in usb xhci packet handling (CVE-2020-25723, bsc#1178934)
• Fix use-after-free in usb iehci packet handling (CVE-2020-25084, bsc#1176673)
• Fix infinite loop (DoS) in usb hcd-ohci emulation (CVE-2020-25625, bsc#1176684)
• Fix OOB access in usb hcd-ohci emulation (CVE-2020-25624, bsc#1176682)
• Fix guest triggerable assert in shared network handling code (CVE-2020-27617, bsc#1178174)
• Fix infinite loop (DoS) in e1000e device emulation (CVE-2020-28916, bsc#1179468)
• Fix OOB access in atapi emulation (CVE-2020-29443, bsc#1181108)
• Fix heap overflow in MSIx emulation (CVE-2020-27821, bsc#1179686)
• Fix null pointer deref. (DoS) in mmio ops (CVE-2020-15469, bsc#1173612)
• Fix infinite loop (DoS) in e1000 device emulation (CVE-2021-20257, bsc#1182577)
• Fix OOB access (stack overflow) in rtl8139 NIC emulation (CVE-2021-3416, bsc#1182968)
• Fix OOB access (stack overflow) in other NIC emulations (CVE-2021-3416)
• Fix OOB access in SLIRP ARP/NCSI packet processing (CVE-2020-29129, bsc#1179466, CVE-2020-29130, bsc#1179467)
• Fix null pointer dereference possibility (DoS) in MegaRAID SAS 8708EM2 emulation (CVE-2020-13659 bsc#1172386)
• Fix issue where s390 guest fails to find zipl boot menu index (bsc#1183979)
• Fix OOB access in iscsi (CVE-2020-11947 bsc#1180523)
• Fix OOB access in vmxnet3 emulation (CVE-2021-20203 bsc#1181639)
• Fix package scripts to not use hard coded paths for temporary working directories and log files (bsc#1182425)
• Fix potential privilege escalation in virtfs (CVE-2021-20181 bsc#1182137)
• Apply fixes to qemu scsi passthrough with respect to timeout and error conditions, including using more correct status codes. (bsc#1178049)
• Fix OOB access in ARM interrupt handling (CVE-2021-20221 bsc#1181933)
• Make note that this patch previously included addresses (CVE-2020-13765 bsc#1172478)
• Tweaks to spec file for better formatting, and remove not needed BuildRequires for e2fsprogs-devel and libpcap-devel
• Fix vfio-pci device on s390 enters error state (bsc#1179725)
• Fix PCI devices are unavailable after a subsystem reset. (bsc#1179726)

This update for qemu fixes the following issues:

• CVE-2020-12829: Fix OOB access in sm501 device emulation (bsc#1172385)
• CVE-2020-25723: Fix use-after-free in usb xhci packet handling (bsc#1178934)
• CVE-2020-25084: Fix use-after-free in usb ehci packet handling (bsc#1176673)
• CVE-2020-25625: Fix infinite loop (DoS) in usb hcd-ohci emulation (bsc#1176684)
• CVE-2020-25624: Fix OOB access in usb hcd-ohci emulation (bsc#1176682)
• CVE-2020-27617: Fix guest triggerable assert in shared network handling code (bsc#1178174)
• CVE-2020-28916: Fix infinite loop (DoS) in e1000e device emulation (bsc#1179468)
• CVE-2020-29443: Fix OOB access in atapi emulation (bsc#1181108)
• CVE-2020-27821: Fix heap overflow in MSIx emulation (bsc#1179686)
• CVE-2020-15469: Fix null pointer deref. (DoS) in mmio ops (bsc#1173612)
• CVE-2021-20257: Fix infinite loop (DoS) in e1000 device emulation (bsc#1182577)
• CVE-2021-3416: Fix OOB access (stack overflow) in rtl8139 NIC emulation (bsc#1182968)
• CVE-2021-3416: Fix OOB access (stack overflow) in other NIC emulations (bsc#1182968)
• CVE-2020-27616: Fix OOB access in ati-vga emulation (bsc#1178400)
• CVE-2020-29129: Fix OOB access in SLIRP ARP/NCSI packet processing (bsc#1179466, CVE-2020-29130, bsc#1179467)
• Fix package scripts to not use hard coded paths for temporary working directories and log files (bsc#1182425)
• Add split-provides through forsplits/13 to cover updates of SLE15-SP2 to SLE15-SP3, and openSUSE equivalents (bsc#1184064)
• Added a few more usability improvements for our git packaging workflow

This update for qemu fixes the following issues:

• Fix OOB access in sm501 device emulation (CVE-2020-12829, bsc#1172385)
• Fix OOB access possibility in MegaRAID SAS 8708EM2 emulation (CVE-2020-13362 bsc#1172383)
• Fix use-after-free in usb xhci packet handling (CVE-2020-25723, bsc#1178934)
• Fix use-after-free in usb ehci packet handling (CVE-2020-25084, bsc#1176673)
• Fix OOB access in usb hcd-ohci emulation (CVE-2020-25624, bsc#1176682)
• Fix infinite loop (DoS) in usb hcd-ohci emulation (CVE-2020-25625, bsc#1176684)
• Fix guest triggerable assert in shared network handling code (CVE-2020-27617, bsc#1178174)
• Fix infinite loop (DoS) in e1000e device emulation (CVE-2020-28916, bsc#1179468)
• Fix OOB access in atapi emulation (CVE-2020-29443, bsc#1181108)
• Fix heap overflow in MSIx emulation (CVE-2020-27821, bsc#1179686)
• Fix null pointer deref. (DoS) in mmio ops (CVE-2020-15469, bsc#1173612)
• Fix infinite loop (DoS) in e1000 device emulation (CVE-2021-20257, bsc#1182577)
• Fix OOB access (stack overflow) in rtl8139 NIC emulation (CVE-2021-3416, bsc#1182968)
• Fix OOB access (stack overflow) in other NIC emulations (CVE-2021-3416)
• Fix OOB access in SLIRP ARP/NCSI packet processing (CVE-2020-29129, bsc#1179466, CVE-2020-29130, bsc#1179467)
• Fix null pointer dereference possibility (DoS) in MegaRAID SAS 8708EM2 emulation (CVE-2020-13659 bsc#1172386)
• Fix issue where s390 guest fails to find zipl boot menu index (bsc#1183979)
• Fix OOB access in iscsi (CVE-2020-11947 bsc#1180523)
• Fix OOB access in vmxnet3 emulation (CVE-2021-20203 bsc#1181639)
• Fix package scripts to not use hard coded paths for temporary working directories and log files (bsc#1182425)
• Fix potential privilege escalation in virtfs (CVE-2021-20181 bsc#1182137)
• Apply fixes to qemu scsi passthrough with respect to timeout and error conditions, including using more correct status codes. (bsc#1178049)
• Fix OOB access in ARM interrupt handling (CVE-2021-20221 bsc#1181933)
• Tweaks to spec file for better formatting, and remove not needed BuildRequires for e2fsprogs-devel and libpcap-devel
• Fix OOB access possibility in ES1370 audio device emulation (CVE-2020-13361 bsc#1172384)
• Fix OOB access in ROM loading (CVE-2020-13765 bsc#1172478)
• Fix OOB access while processing USB packets (CVE-2020-14364 bsc#1175441)
• Fix DoS in packet processing of various emulated NICs (CVE-2020-16092 bsc#1174641)
• Fix buffer overflow in the XGMAC device (CVE-2020-15863 bsc#1174386)
• Use '%service_del_postun_without_restart' instead of '%service_del_postun' to avoid 'Failed to try-restart [email protected]' error while updating the qemu-guest-agent. (bsc#1178565)

This update for qemu fixes the following issues:

• Switch method of splitting off hw-s390x-virtio-gpu-ccw.so as a module to what was accepted upstream (bsc#1181103)
• Fix OOB access in sdhci interface (CVE-2020-17380, bsc#1175144, CVE-2020-25085, bsc#1176681, CVE-2021-3409, bsc#1182282)
• Fix potential privilege escalation in virtiofsd tool (CVE-2021-20263, bsc#1183373)
• Fix OOB access (stack overflow) in rtl8139 NIC emulation (CVE-2021-3416, bsc#1182968)
• Fix heap overflow in MSIx emulation (CVE-2020-27821, bsc#1179686)
• Fix package scripts to not use hard coded paths for temporary working directories and log files (bsc#1182425)
• QEMU BIOS fails to read stage2 loader on s390x (bsc#1186290)
• For the record, these issues are fixed in this package already. Most are alternate references to previously mentioned issues: (CVE-2019-15890, bsc#1149813, CVE-2020-8608, bsc#1163019, CVE-2020-14364, bsc#1175534, CVE-2020-25707, bsc#1178683, CVE-2020-25723, bsc#1178935, CVE-2020-29130, bsc#1179477, CVE-2020-29129, bsc#1179484, CVE-2021-3419, bsc#1182975)

It was discovered that QEMU incorrectly handled memory in iSCSI emulation. An attacker inside the guest could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2020-11947)

Alexander Bulekov discovered that QEMU incorrectly handled Intel e1000e emulation. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2020-15859)

Alexander Bulekov discovered that QEMU incorrectly handled memory region cache. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS, and Ubuntu 20.10. (CVE-2020-27821)

Cheol-woo Myung discovered that QEMU incorrectly handled Intel e1000e emulation. An attacker inside the guest could use this issue to cause a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 20.10. (CVE-2020-28916)

Wenxiang Qian discovered that QEMU incorrectly handled ATAPI emulation. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2020-29443)

It was discovered that QEMU incorrectly handled VirtFS directory sharing. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2021-20181)