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CVE details

CVE-2021-20257

An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Score
6.5 medium
Published
2022-03-16
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>6.2.0</lt></range>
      </package>
      <package>
	<name>qemu-user-static</name>
	<range><lt>6.2.0</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>An infinite loop flaw was found in the e1000 NIC emulator of the QEMU.
	This issue occurs while processing transmits (tx) descriptors in
	process_tx_desc if various descriptor fields are initialized with
	invalid values. This flaw allows a guest to consume CPU cycles on the
	host, resulting in a denial of service. The highest threat from this
	vulnerability is to system availability.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2021-20257</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2021-20257</url>
    </references>
    <dates>
      <discovery>2022-03-16</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>