CVE-2020-10717

Description

A potential DoS flaw was found in the virtio-fs shared file system daemon (virtiofsd) implementation of the QEMU version >= v5.0. Virtio-fs is meant to share a host file system directory with a guest via virtio-fs device. If the guest opens the maximum number of file descriptors under the shared directory, a denial of service may occur. This flaw allows a guest user/process to cause this denial of service on the host.

CVSS Metrics

• v3.1•LOW•Score: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
• v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
• v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.16%• Percentile: 37%

Techniques & Countermeasures

• CWE-770•Allocation of Resources Without Limits or Throttling

  The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Affected Systems

• qemu•qemu

  ≥ 5.0, < 5.0.1

• the qemu project•qemu

  ≥ QEMU v5.0

References (5)

• https://security.gentoo.org/glsa/202011-09
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10717
• https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00143.html
• https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00141.html
• https://www.openwall.com/lists/oss-security/2020/05/04/1