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      <title>CVE-2023-3640 — Kernel: x86/mm: a per-cpu entry area leak was identified through the init_cea_offsets function when prefetchnta and pre…</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2023-3640</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9&lt;/p&gt;
&lt;p&gt;A possible unauthorized memory access flaw was found in the Linux kernel&amp;#39;s cpu_entry_area mapping of X86 CPU data to memory, where a user may guess the location of exception stacks or other important data. Based on the previous CVE-2023-0597, the &amp;#39;Randomize per-cpu entry area&amp;#39; feature was implemented in /arch/x86/mm/cpu_entry_area.c, which works through the init_cea_offsets() function when KASLR is enabled. However, despite this feature, there is still a risk of per-cpu entry area leaks. This issue could allow a local user to gain access to some important data with memory in an expected location and potentially escalate their privileges on the system.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9&lt;/p&gt;
&lt;p&gt;A possible unauthorized memory access flaw was found in the Linux kernel&amp;#39;s cpu_entry_area mapping of X86 CPU data to memory, where a user may guess the location of exception stacks or other important data. Based on the previous CVE-2023-0597, the &amp;#39;Randomize per-cpu entry area&amp;#39; feature was implemented in /arch/x86/mm/cpu_entry_area.c, which works through the init_cea_offsets() function when KASLR is enabled. However, despite this feature, there is still a risk of per-cpu entry area leaks. This issue could allow a local user to gain access to some important data with memory in an expected location and potentially escalate their privileges on the system.&lt;/p&gt;</content:encoded>
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