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CVE details

CVE-2021-20181

A race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0. This flaw allows a malicious 9p client to cause a use-after-free error, potentially escalating their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.

Score
7.5 high
Published
2021-05-13
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>A race condition flaw was found in the 9pfs server implementation of
	QEMU up to and including 5.2.0. This flaw allows a malicious 9p client
	to cause a use-after-free error, potentially escalating their
	privileges on the system. The highest threat from this vulnerability
	is to confidentiality, integrity as well as system availability.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2021-20181</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2021-20181</url>
    </references>
    <dates>
      <discovery>2021-05-13</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>