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CVE details

CVE-2021-20203

An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

Score
3.2 low
Published
2021-02-25
Links
NVD · cve.org

Affected ports (2)

PortPackageVersionStatusMaintainer
emulators/qemu-cheriqemu-cheri0.d20260108unaddressedbrooks@FreeBSD.org
emulators/qemu-user-staticqemu-user-static3.1.0_16unaddressedemulation@FreeBSD.org

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>qemu-cheri</name>
	<range><lt>FIXME</lt></range>
      </package>
      <package>
	<name>qemu-user-static</name>
	<range><lt>FIXME</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>An integer overflow issue was found in the vmxnet3 NIC emulator of the
	QEMU for versions up to v5.2.0. It may occur if a guest was to supply
	invalid values for rx/tx queue size or other NIC parameters. A
	privileged guest user may use this flaw to crash the QEMU process on
	the host resulting in DoS scenario.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2021-20203</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2021-20203</url>
    </references>
    <dates>
      <discovery>2021-02-25</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>