{"id":"UBUNTU-CVE-2021-3638","details":"An out-of-bounds memory access flaw was found in the ATI VGA device emulation of QEMU. This flaw occurs in the ati_2d_blt() routine while handling MMIO write operations when the guest provides invalid values for the destination display parameters. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service.","modified":"2026-01-30T02:25:45.212437Z","published":"2022-03-03T23:15:00Z","related":["USN-6567-1"],"upstream":["CVE-2021-3638"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3638"},{"type":"REPORT","url":"https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg01682.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6567-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-3638"}],"affected":[{"package":{"name":"qemu","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/qemu@1:4.2-3ubuntu6.28?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.2-3ubuntu6.28"}]}],"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","1:4.2-3ubuntu6.12","1:4.2-3ubuntu6.14","1:4.2-3ubuntu6.15","1:4.2-3ubuntu6.16","1:4.2-3ubuntu6.17","1:4.2-3ubuntu6.18","1:4.2-3ubuntu6.19","1:4.2-3ubuntu6.21","1:4.2-3ubuntu6.23","1:4.2-3ubuntu6.24","1:4.2-3ubuntu6.25","1:4.2-3ubuntu6.26","1:4.2-3ubuntu6.27"],"ecosystem_specific":{"binaries":[{"binary_name":"qemu","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-block-extra","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-guest-agent","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-kvm","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-system","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-system-arm","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-system-common","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-system-data","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-system-gui","binary_version":"1:4.2-3ubuntu6.28"},{"binary_version":"1:4.2-3ubuntu6.28","binary_name":"qemu-system-mips"},{"binary_name":"qemu-system-misc","binary_version":"1:4.2-3ubuntu6.28"},{"binary_version":"1:4.2-3ubuntu6.28","binary_name":"qemu-system-ppc"},{"binary_version":"1:4.2-3ubuntu6.28","binary_name":"qemu-system-s390x"},{"binary_version":"1:4.2-3ubuntu6.28","binary_name":"qemu-system-sparc"},{"binary_name":"qemu-system-x86","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-system-x86-microvm","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-system-x86-xen","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-user","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-user-binfmt","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-user-static","binary_version":"1:4.2-3ubuntu6.28"},{"binary_name":"qemu-utils","binary_version":"1:4.2-3ubuntu6.28"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3638.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}