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      <title>CVE-2026-102702 — Arm: multiple issues with GNTTABOP_cache_flush</title>
      <link>https://db.gcve.eu/vuln/cve-2026-102702</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;1) XSA-437 (CVE-2023-34321) addressed issues with overflows in
   calculations involved in guests flushing caches through
   GNTTABOP_cache_flush.  Unfortunately the fix there introduced a
   calculation which may underflow, resulting in a loop which would - at
   least on 64-bit Arm - take excessively long, and which would likely
   eventually crash the hypervisor.&lt;/p&gt;
&lt;p&gt;This is CVE-2026-102699.&lt;/p&gt;
&lt;p&gt;2) GNTTABOP_cache_flush may be issued on memory mapped from another
   domain using the grant table interface.  However there was no
   restriction to disallow the use of invalidate-without-clean against
   read-only grant mappings, which may corrupt the granted memory.&lt;/p&gt;
&lt;p&gt;This is CVE-2026-102702.&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;1) XSA-437 (CVE-2023-34321) addressed issues with overflows in
   calculations involved in guests flushing caches through
   GNTTABOP_cache_flush.  Unfortunately the fix there introduced a
   calculation which may underflow, resulting in a loop which would - at
   least on 64-bit Arm - take excessively long, and which would likely
   eventually crash the hypervisor.&lt;/p&gt;
&lt;p&gt;This is CVE-2026-102699.&lt;/p&gt;
&lt;p&gt;2) GNTTABOP_cache_flush may be issued on memory mapped from another
   domain using the grant table interface.  However there was no
   restriction to disallow the use of invalidate-without-clean against
   read-only grant mappings, which may corrupt the granted memory.&lt;/p&gt;
&lt;p&gt;This is CVE-2026-102702.&lt;/p&gt;</content:encoded>
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