{
  "cveId": "CVE-2021-3929",
  "url": "https://patchblox.com/security/cve/CVE-2021-3929",
  "summary": "CVE-2021-3929 is fixed in 20 products on 1 platform, first by qemu 1:6.2\u002Bdfsg-2ubuntu6.2, released April 29, 2022. It is not reported as exploited. Patch Radar priority: High.",
  "title": "qemu: A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU",
  "description": "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.",
  "published": "2021-12-23T16:00:00Z",
  "severity": "high",
  "cvss": 8.2,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
  "epss": 0.00678,
  "epssPercentile": 0.52569,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "qemu",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1:7.0\u002Bdfsg-1",
      "fix": "DEBIAN-CVE-2021-3929",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3929",
      "released": "2022-08-25T20:15:09Z"
    },
    {
      "platform": "linux",
      "product": "qemu",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1:7.0\u002Bdfsg-1",
      "fix": "DEBIAN-CVE-2021-3929",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3929",
      "released": "2022-08-25T20:15:09Z"
    },
    {
      "platform": "linux",
      "product": "qemu",
      "release": "Debian 14",
      "fixedVersion": "1:7.0\u002Bdfsg-1",
      "fix": "DEBIAN-CVE-2021-3929",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3929",
      "released": "2022-08-25T20:15:09Z"
    },
    {
      "platform": "linux",
      "product": "qemu",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-block-extra",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-block-extra 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-block-extra-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-guest-agent",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-guest-agent 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-guest-agent-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-arm",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system-arm 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-arm-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-common",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system-common 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-common-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-data",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system-data 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-data-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-gui",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system-gui 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-gui-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-mips",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system-mips 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-mips-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-misc",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system-misc 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-misc-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-ppc",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system-ppc 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-ppc-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-s390x",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system-s390x 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-s390x-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-sparc",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system-sparc 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-sparc-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-x86",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system-x86 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-x86-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-x86-microvm",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system-x86-microvm 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-x86-microvm-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-x86-xen",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-system-x86-xen 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-system-x86-xen-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-user",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-user 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-user-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-user-binfmt",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-user-binfmt 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-user-binfmt-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-user-static",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-user-static 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-user-static-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-utils",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:6.2\u002Bdfsg-2ubuntu6.2",
      "fix": "qemu-utils 1:6.2\u002Bdfsg-2ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-qemu-utils-1-6.2-dfsg-2ubuntu6.2",
      "released": "2022-04-29T10:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}