{"id":"UBUNTU-CVE-2020-27821","details":"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.","modified":"2026-02-04T02:37:13.446352Z","published":"2020-12-08T22:15:00Z","related":["USN-4725-1"],"upstream":["CVE-2020-27821"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-27821"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4725-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-27821"}],"affected":[{"package":{"name":"qemu","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/qemu@1:4.2-3ubuntu6.12?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.2-3ubuntu6.12"}]}],"versions":["1:4.0+dfsg-0ubuntu9","1:4.0+dfsg-0ubuntu10","1:4.2-1ubuntu1","1:4.2-1ubuntu2","1:4.2-3ubuntu1","1:4.2-3ubuntu2","1:4.2-3ubuntu3","1:4.2-3ubuntu4","1:4.2-3ubuntu5","1:4.2-3ubuntu6","1:4.2-3ubuntu6.1","1:4.2-3ubuntu6.2","1:4.2-3ubuntu6.3","1:4.2-3ubuntu6.4","1:4.2-3ubuntu6.5","1:4.2-3ubuntu6.6","1:4.2-3ubuntu6.7","1:4.2-3ubuntu6.8","1:4.2-3ubuntu6.9","1:4.2-3ubuntu6.10","1:4.2-3ubuntu6.11"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"qemu","binary_version":"1:4.2-3ubuntu6.12"},{"binary_version":"1:4.2-3ubuntu6.12","binary_name":"qemu-block-extra"},{"binary_name":"qemu-guest-agent","binary_version":"1:4.2-3ubuntu6.12"},{"binary_version":"1:4.2-3ubuntu6.12","binary_name":"qemu-kvm"},{"binary_name":"qemu-system","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-system-arm","binary_version":"1:4.2-3ubuntu6.12"},{"binary_version":"1:4.2-3ubuntu6.12","binary_name":"qemu-system-common"},{"binary_version":"1:4.2-3ubuntu6.12","binary_name":"qemu-system-data"},{"binary_name":"qemu-system-gui","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-system-mips","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-system-misc","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-system-ppc","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-system-s390x","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-system-sparc","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-system-x86","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-system-x86-microvm","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-system-x86-xen","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-user","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-user-binfmt","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-user-static","binary_version":"1:4.2-3ubuntu6.12"},{"binary_name":"qemu-utils","binary_version":"1:4.2-3ubuntu6.12"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-27821.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}