Vulnerability · Published Dec 8, 2020 · Assigned by redhat
CVE-2020-27821
Medium 6.0
In plain English
A medium-severity out-of-bounds write in QEMU. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.0Medium
Exploit odds (30 days)0.4%top 69.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | hivex | 1.3.18-20.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | hivex-devel | 1.3.18-20.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | libguestfs-winsupport | 8.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | libguestfs-winsupport | 8.2-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | libiscsi | 1.18.0-8.module_el8.6.0+2880+7d9e3703 | ALSA-2021:1762 |
| AlmaLinux:8 | libiscsi | 1.18.0-8.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | libiscsi | 1.18.0-8.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | libiscsi-devel | 1.18.0-8.module_el8.6.0+2880+7d9e3703 | ALSA-2021:1762 |
| AlmaLinux:8 | libiscsi-devel | 1.18.0-8.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | libiscsi-devel | 1.18.0-8.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | libiscsi-utils | 1.18.0-8.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | libiscsi-utils | 1.18.0-8.module_el8.6.0+2880+7d9e3703 | ALSA-2021:1762 |
| AlmaLinux:8 | libiscsi-utils | 1.18.0-8.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | libnbd | 1.2.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | libnbd | 1.2.2-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | libnbd-devel | 1.2.2-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | libnbd-devel | 1.2.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | libvirt-dbus | 1.3.0-2.module_el8.6.0+2880+7d9e3703 | ALSA-2021:1762 |
| AlmaLinux:8 | libvirt-dbus | 1.3.0-2.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | libvirt-dbus | 1.3.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdfuse | 1.2.2-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | nbdfuse | 1.2.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-bash-completion | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-basic-filters | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-basic-plugins | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-curl-plugin | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-devel | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-example-plugins | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-gzip-plugin | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-linuxdisk-plugin | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-python-plugin | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-server | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-ssh-plugin | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-vddk-plugin | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | nbdkit-xz-filter | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | netcf | 0.2.8-12.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | netcf | 0.2.8-12.module_el8.6.0+2880+7d9e3703 | ALSA-2021:1762 |
| AlmaLinux:8 | netcf | 0.2.8-12.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | netcf-devel | 0.2.8-12.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | netcf-devel | 0.2.8-12.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | netcf-devel | 0.2.8-12.module_el8.6.0+2880+7d9e3703 | ALSA-2021:1762 |
| AlmaLinux:8 | netcf-libs | 0.2.8-12.module_el8.6.0+2880+7d9e3703 | ALSA-2021:1762 |
| AlmaLinux:8 | netcf-libs | 0.2.8-12.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | netcf-libs | 0.2.8-12.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | ocaml-hivex | 1.3.18-20.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | ocaml-hivex-devel | 1.3.18-20.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | ocaml-libguestfs | 1:1.40.2-27.module_el8.4.0+2358+630e803b.alma | ALSA-2021:1762 |
| AlmaLinux:8 | ocaml-libguestfs-devel | 1:1.40.2-27.module_el8.4.0+2358+630e803b.alma | ALSA-2021:1762 |
| AlmaLinux:8 | ocaml-libnbd | 1.2.2-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | ocaml-libnbd-devel | 1.2.2-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | perl-Sys-Virt | 6.0.0-1.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | perl-Sys-Virt | 6.0.0-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | perl-hivex | 1.3.18-20.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | python3-hivex | 1.3.18-20.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | python3-libnbd | 1.2.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | python3-libnbd | 1.2.2-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | python3-libvirt | 6.0.0-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | python3-libvirt | 6.0.0-1.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | ruby-hivex | 1.3.18-20.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | seabios | 1.13.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | seabios-bin | 1.13.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | seavgabios-bin | 1.13.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | sgabios | 1:0.20170427git-3.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | sgabios | 1:0.20170427git-3.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:1762 |
| AlmaLinux:8 | sgabios-bin | 1:0.20170427git-3.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | sgabios-bin | 1:0.20170427git-3.module_el8.6.0+2880+7d9e3703 | ALSA-2021:1762 |
| AlmaLinux:8 | supermin | 5.1.19-10.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| AlmaLinux:8 | supermin-devel | 5.1.19-10.module_el8.5.0+2608+72063365 | ALSA-2021:1762 |
| Alpine:v3.20 | qemu | 5.2.0-r0 | ALPINE-CVE-2020-27821 |
| Alpine:v3.21 | qemu | 5.2.0-r0 | ALPINE-CVE-2020-27821 |
| Alpine:v3.22 | qemu | 5.2.0-r0 | ALPINE-CVE-2020-27821 |
| Alpine:v3.23 | qemu | 5.2.0-r0 | ALPINE-CVE-2020-27821 |
| Alpine:v3.24 | qemu | 5.2.0-r0 | ALPINE-CVE-2020-27821 |
| Debian:12 | qemu | 1:5.2+dfsg-3 | DEBIAN-CVE-2020-27821 |
| Debian:13 | qemu | 1:5.2+dfsg-3 | DEBIAN-CVE-2020-27821 |
| Debian:14 | qemu | 1:5.2+dfsg-3 | DEBIAN-CVE-2020-27821 |
| Rocky Linux:8 | hivex | 0:1.3.18-20.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | libguestfs | 1:1.40.2-27.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | libguestfs-winsupport | 0:8.2-1.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | libiscsi | 0:1.18.0-8.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | libiscsi | 0:1.18.0-8.module+el8.7.0+1084+97b81f61 | RLSA-2021:1762 |
| Rocky Linux:8 | libiscsi | 0:1.18.0-8.module+el8.6.0+847+b490afdd | RLSA-2021:1762 |
| Rocky Linux:8 | libnbd | 0:1.2.2-1.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | libvirt | 0:6.0.0-35.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | libvirt-dbus | 0:1.3.0-2.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | libvirt-dbus | 0:1.3.0-2.module+el8.7.0+1084+97b81f61 | RLSA-2021:1762 |
| Rocky Linux:8 | libvirt-dbus | 0:1.3.0-2.module+el8.6.0+847+b490afdd | RLSA-2021:1762 |
| Rocky Linux:8 | libvirt-python | 0:6.0.0-1.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | nbdkit | 0:1.16.2-4.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | netcf | 0:0.2.8-12.module+el8.6.0+847+b490afdd | RLSA-2021:1762 |
| Rocky Linux:8 | netcf | 0:0.2.8-12.module+el8.7.0+1084+97b81f61 | RLSA-2021:1762 |
| Rocky Linux:8 | netcf | 0:0.2.8-12.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | perl-Sys-Virt | 0:6.0.0-1.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | qemu-kvm | 5:4.2.0-48.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | seabios | 0:1.13.0-2.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | sgabios | 1:0.20170427git-3.module+el8.7.0+1084+97b81f61 | RLSA-2021:1762 |
| Rocky Linux:8 | sgabios | 1:0.20170427git-3.module+el8.6.0+847+b490afdd | RLSA-2021:1762 |
| Rocky Linux:8 | sgabios | 1:0.20170427git-3.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
| Rocky Linux:8 | supermin | 0:5.1.19-10.module+el8.4.0+534+4680a14e | RLSA-2021:1762 |
Affected products (as reported)
Weakness: CWE-787
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1902651 x_refsource_MISC
- [oss-security] 20201216 CVE-2020-27821 QEMU: heap buffer overflow in msix_table_mmio_write() in hw/pci/msix.c mailing-list, x_refsource_MLIST
- https://security.netapp.com/advisory/ntap-20210115-0006/ x_refsource_CONFIRM
- [debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security update mailing-list, x_refsource_MLIST