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The IA32 system call emulation functionality in Linux kernel 2.4.x and 2.6.x before 126.96.36.199, when running on the x86_64 architecture, does not zero extend the eax register after the 32bit entry path to ptrace is used, which might allow local users to gain privileges by triggering an out-of-bounds access to the system call table using the %RAX register.
This issue affected users who were running 64-bit versions of Red Hat Enterprise Linux 3, 4, or 5 on x86_64 architecture. It did not affect users of Red Hat Enterprise Linux 2.1.
Updates are available for Red Hat Enterprise Linux 3, 4, and 5 to correct
this issue. New kernel packages along with our advisory are available at
the URL below as well as via the Red Hat Network. http://rhn.redhat.com/errata/CVE-2007-4573.html
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https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9735 [No Types Assigned]
http://oval.mitre.org/repository/data/getDef?id=oval:org.mitre.oval:def:9735 [No Types Assigned]