{"id":"UBUNTU-CVE-2021-3929","details":"A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU. This CVE is similar to CVE-2021-3750 and, just like it, when the reentrancy write triggers the reset function nvme_ctrl_reset(), data structs will be freed leading to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition or, potentially, executing arbitrary code within the context of the QEMU process on the host.","modified":"2026-01-30T00:50:25.390655Z","published":"2021-12-24T00:00:00Z","related":["USN-5489-1"],"upstream":["CVE-2021-3929"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3929"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5489-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-3929"}],"affected":[{"package":{"name":"qemu","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/qemu@1:6.2+dfsg-2ubuntu6.2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:6.2+dfsg-2ubuntu6.2"}]}],"versions":["1:6.0+dfsg-2expubuntu1","1:6.0+dfsg-2expubuntu2","1:6.0+dfsg-2expubuntu4","1:6.2+dfsg-2ubuntu5","1:6.2+dfsg-2ubuntu6","1:6.2+dfsg-2ubuntu6.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"qemu","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-block-extra","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-guest-agent","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-system","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-system-arm","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-system-common","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-system-data","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-system-gui","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_version":"1:6.2+dfsg-2ubuntu6.2","binary_name":"qemu-system-mips"},{"binary_version":"1:6.2+dfsg-2ubuntu6.2","binary_name":"qemu-system-misc"},{"binary_name":"qemu-system-ppc","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-system-s390x","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-system-sparc","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-system-x86","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-system-x86-microvm","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-system-x86-xen","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-user","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-user-binfmt","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-user-static","binary_version":"1:6.2+dfsg-2ubuntu6.2"},{"binary_name":"qemu-utils","binary_version":"1:6.2+dfsg-2ubuntu6.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3929.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:H/I:H/A:H"},{"type":"Ubuntu","score":"low"}]}