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CVE details

CVE-2026-56000

Local attackers with a X connection able to provide GLX commit to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a Heap Use After Free, due to CommonMakeCurrent() pointing into potentially reallocated memory.

Score
9.0 critical
Published
2026-07-08
Links
NVD · cve.org

Matched ports (4)

PortPackageVersionStatusMaintainer
x11-servers/xorg-serverxephyr21.1.25,1unaddressedx11@FreeBSD.org
x11-servers/xorg-serverxorg-nestserver21.1.25,2unaddressedx11@FreeBSD.org
x11-servers/xorg-serverxorg-vfbserver21.1.25,1unaddressedx11@FreeBSD.org
x11-servers/xorg-serverxorg-server21.1.25,1fixedx11@FreeBSD.org

VuXML

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>xephyr</name>
	<range><lt>21.2.24</lt></range>
      </package>
      <package>
	<name>xorg-nestserver</name>
	<range><lt>21.2.24</lt></range>
      </package>
      <package>
	<name>xorg-vfbserver</name>
	<range><lt>21.2.24</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>Local attackers with a X connection able to provide GLX commit to the
	X server xorg-server before 21.2.24 and xwayland before 24.1.13 could
	cause a Heap Use After Free, due to CommonMakeCurrent() pointing into
	potentially reallocated memory.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-56000</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-56000</url>
    </references>
    <dates>
      <discovery>2026-07-08</discovery>
      <entry>2026-10-26</entry>
    </dates>
  </vuln>