{
  "cveId": "CVE-2015-8550",
  "url": "https://patchblox.com/security/cve/CVE-2015-8550",
  "summary": "CVE-2015-8550 is fixed in 42 products on 1 platform, first by libxencall1t64 4.6.0-1ubuntu2, released December 17, 2015. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libxencall1t64: Xen, when used on a system providing PV backends, allows local guest OSadministrators to cause a denial of service (h...",
  "description": "Xen, when used on a system providing PV backends, allows local guest OSadministrators to cause a denial of service (host OS crash) or gainprivileges by writing to memory shared between the frontend and backend,aka a double fetch vulnerability.",
  "published": "2015-12-17T00:00:00Z",
  "severity": "Medium",
  "epss": 0.0108,
  "epssPercentile": 0.65259,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libxencall1t64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "libxencall1t64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libxencall1t64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libxendevicemodel1t64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "libxendevicemodel1t64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libxendevicemodel1t64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libxenevtchn1t64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "libxenevtchn1t64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libxenevtchn1t64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libxenforeignmemory1t64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "libxenforeignmemory1t64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libxenforeignmemory1t64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libxengnttab1t64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "libxengnttab1t64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libxengnttab1t64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libxenhypfs1t64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "libxenhypfs1t64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libxenhypfs1t64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libxenmisc4.17t64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "libxenmisc4.17t64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libxenmisc4.17t64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libxenstore4t64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "libxenstore4t64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libxenstore4t64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libxentoolcore1t64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "libxentoolcore1t64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libxentoolcore1t64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libxentoollog1t64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "libxentoollog1t64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libxentoollog1t64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-block-extra",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-block-extra 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-block-extra-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-block-supplemental",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-block-supplemental 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-block-supplemental-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-guest-agent",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-guest-agent 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-guest-agent-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-arm",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-arm 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-arm-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-common",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-common 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-common-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-data",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-data 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-data-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-gui",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-gui 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-gui-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-mips",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-mips 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-mips-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-misc",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-misc 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-misc-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-modules-opengl",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-modules-opengl 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-modules-opengl-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-modules-spice",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-modules-spice 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-modules-spice-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-ppc",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-ppc 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-ppc-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-s390x",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-s390x 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-s390x-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-sparc",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-sparc 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-sparc-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-x86",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-x86 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-x86-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-x86-xen",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-x86-xen 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-x86-xen-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-system-xen",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-system-xen 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-system-xen-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-user",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-user 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-user-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-user-binfmt",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-user-binfmt 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-user-binfmt-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-user-static",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-user-static 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-user-static-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "qemu-utils",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:2.5\u002Bdfsg-1ubuntu5",
      "fix": "qemu-utils 1:2.5\u002Bdfsg-1ubuntu5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-qemu-utils-1-2.5-dfsg-1ubuntu5",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xen-hypervisor-4.17-amd64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "xen-hypervisor-4.17-amd64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-xen-hypervisor-4.17-amd64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xen-hypervisor-4.17-arm64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "xen-hypervisor-4.17-arm64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-xen-hypervisor-4.17-arm64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xen-hypervisor-4.17-armhf",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "xen-hypervisor-4.17-armhf 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-xen-hypervisor-4.17-armhf-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xen-hypervisor-common",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "xen-hypervisor-common 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-xen-hypervisor-common-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xen-system-amd64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "xen-system-amd64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-xen-system-amd64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xen-system-arm64",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "xen-system-arm64 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-xen-system-arm64-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xen-system-armhf",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "xen-system-armhf 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-xen-system-armhf-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xen-utils-4.17",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "xen-utils-4.17 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-xen-utils-4.17-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xen-utils-common",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "xen-utils-common 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-xen-utils-common-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xenstore-utils",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "4.6.0-1ubuntu2",
      "fix": "xenstore-utils 4.6.0-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-xenstore-utils-4.6.0-1ubuntu2",
      "released": "2015-12-17T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-07T12:40:37Z"
}