diff --git a/src/arch/x86/X86ISA.py b/src/arch/x86/X86ISA.py
index 2760b76..bb72c41 100644
--- a/src/arch/x86/X86ISA.py
+++ b/src/arch/x86/X86ISA.py
@@ -42,6 +42,15 @@
     cxx_class = "gem5::X86ISA::ISA"
     cxx_header = "arch/x86/isa.hh"
 
+    # Here we set the default vector string to "HygonGenuine". Previously this
+    # "M5 Simulator" but due to stricter checks in newer versions of GLIBC,
+    # the CPUID is checked for the required features. As "M5 Simulator" is not
+    # genuine CPUID, an error is returned. This change
+    # https://gem5-review.googlesource.com/c/public/gem5/+/64831 changed this
+    # to "GenuineAMD" but due to issues with booting the Linux Kernel using
+    # this vector string (highlighted here:
+    # https://gem5.atlassian.net/browse/GEM5-1300) we opted to use
+    # "HygonGenuine" instead.
     vendor_string = Param.String(
-        "AuthenticAMD", "Vendor string for CPUID instruction"
+        "HygonGenuine", "Vendor string for CPUID instruction"
     )