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    <link>https://cve.radiocsirt.org</link>
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    <lastBuildDate>Mon, 05 Oct 2026 16:15:24 +0000</lastBuildDate>
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      <title>CVE-2026-89653 — ceph: reject export_targets ranks &gt;= CEPH_MAX_MDS in mdsmap decode</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-89653</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;ceph: reject export_targets ranks &amp;gt;= CEPH_MAX_MDS in mdsmap decode&lt;/p&gt;
&lt;p&gt;MDSMap export_targets entries are monitor controlled. check_new_map()
uses each entry as a bit number in a fixed stack bitmap, so a rank
outside the protocol namespace can make set_bit() write past the end of
the array.&lt;/p&gt;
&lt;p&gt;Reject ranks outside CEPH_MAX_MDS while decoding the map. Do not
validate against possible_max_rank here because maps may legitimately
reference ranks beyond a temporarily reduced max_mds.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;ceph: reject export_targets ranks &amp;gt;= CEPH_MAX_MDS in mdsmap decode&lt;/p&gt;
&lt;p&gt;MDSMap export_targets entries are monitor controlled. check_new_map()
uses each entry as a bit number in a fixed stack bitmap, so a rank
outside the protocol namespace can make set_bit() write past the end of
the array.&lt;/p&gt;
&lt;p&gt;Reject ranks outside CEPH_MAX_MDS while decoding the map. Do not
validate against possible_max_rank here because maps may legitimately
reference ranks beyond a temporarily reduced max_mds.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-89653</guid>
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