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    <title>Most recent entries from all</title>
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      <title>CVE-2026-42489 — domctl lock open to abuse</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-42489</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Xen&lt;/p&gt;
&lt;p&gt;[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]&lt;/p&gt;
&lt;p&gt;To create and manage guests, domctl operations are used by the control
domain, a possible Xenstore domain, or by a domain controlling a
particular guest.  Some of these operations may not be executed in
parallel, so a system-wide lock is used.  The way that lock is acquired
is, however, not providing any fairness.  This is CVE-2026-42489.&lt;/p&gt;
&lt;p&gt;Furthermore, with XSM/Flask in use, the lock acquire will, for some
operations, occur ahead of any permission checking.  This is
CVE-2026-42490.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Xen&lt;/p&gt;
&lt;p&gt;[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]&lt;/p&gt;
&lt;p&gt;To create and manage guests, domctl operations are used by the control
domain, a possible Xenstore domain, or by a domain controlling a
particular guest.  Some of these operations may not be executed in
parallel, so a system-wide lock is used.  The way that lock is acquired
is, however, not providing any fairness.  This is CVE-2026-42489.&lt;/p&gt;
&lt;p&gt;Furthermore, with XSM/Flask in use, the lock acquire will, for some
operations, occur ahead of any permission checking.  This is
CVE-2026-42490.&lt;/p&gt;</content:encoded>
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