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CVE details

CVE-2021-4206

A flaw was found in the QXL display device emulation in QEMU. An integer overflow in the cursor_alloc() function can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. This flaw allows a malicious privileged guest user to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.

Score
8.2 high
Published
2022-04-29
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>7.0.0</lt></range>
      </package>
      <package>
	<name>qemu-user-static</name>
	<range><lt>7.0.0</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>A flaw was found in the QXL display device emulation in QEMU. An
	integer overflow in the cursor_alloc() function can lead to the
	allocation of a small cursor object followed by a subsequent
	heap-based buffer overflow. This flaw allows a malicious privileged
	guest user to crash the QEMU process on the host or potentially
	execute arbitrary code within the context of the QEMU process.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2021-4206</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2021-4206</url>
    </references>
    <dates>
      <discovery>2022-04-29</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>