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<h1 id="cve-2023-23583-microcode_ctl">CVE-2023-23583: microcode_ctl<a class="headerlink" href="#cve-2023-23583-microcode_ctl" title="Permanent link">&para;</a></h1>
<h2 id="title">Title<a class="headerlink" href="#title" title="Permanent link">&para;</a></h2>
<p>CVE-2023-23583: microcode_ctl: Intel CPUs: execution of MOVSB instructions with redundant REX prefix leads to unintended system behavior</p>
<h2 id="summary">Summary<a class="headerlink" href="#summary" title="Permanent link">&para;</a></h2>
<p>As described by <a href="https://www.openwall.com/lists/oss-security/2023/11/14/4">Intel</a>:</p>
<p>Under certain microarchitectural conditions, Intel has identified cases where execution of an instruction (REP MOVSB) encoded with a redundant REX prefix may result in unpredictable system behavior resulting in a system crash/hang, or, in some limited scenarios, may allow escalation of privilege from CPL3 to CPL0.</p>
<p>and by <a href="https://access.redhat.com/security/cve/CVE-2023-23583">Red Hat</a>:</p>
<p>A security vulnerability was found in some Intel processors. Execution of REP MOVSB instructions with a redundant REX prefix may result in execution continuing at an incorrect EIP address after a micro-architectural event occurs, potentially allowing privilege escalation, information disclosure and/or a denial of service via local access.</p>
<p>as well as in <a href="https://www.cve.org/CVERecord?id=CVE-2023-23583">CVE-2023-23583</a>.</p>
<p>More detail is available via these <a href="https://www.openwall.com/lists/oss-security/2023/11/14/7">links to Intel's website</a> and in the public disclosure by <a href="https://lock.cmpxchg8b.com/reptar.html">Tavis Ormandy</a> from <a href="https://cloud.google.com/blog/products/identity-security/google-researchers-discover-reptar-a-new-cpu-vulnerability">Google</a>.</p>
<p>Public disclosure date: November 14, 2023</p>
<h2 id="el9">EL9<a class="headerlink" href="#el9" title="Permanent link">&para;</a></h2>
<ul>
<li>Fixed in version: <code>4:20231114-1.el9_2.security</code> available November 15, 2023</li>
</ul>
<p>Please refer to our <a href="/packages/microcode_ctl.md">override package of microcode_ctl</a>.</p>
<h2 id="el8">EL8<a class="headerlink" href="#el8" title="Permanent link">&para;</a></h2>
<ul>
<li>Not fixed yet, will fix.</li>
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