vulnerability note CVE-2013-0309
Linux kernel: denial of service via pmd_present
Synthesis of the vulnerability
A local attacker can use Transparent Huge Pages, in order to stop the system.Impacted products:
Linux, openSUSE, RHEL.
BID-58046, CVE-2013-0309, openSUSE-SU-2013:0396-1, RHSA-2013:0496-02, VIGILANCE-VUL-12439.
Description of the vulnerability
A THP (Transparent Huge Page) allows the usage of a large memory area.
However, when a THP is protected (mprotect) with PROT_NONE, the pmd_present() function of the arch/x86/include/asm/pgtable.h file uses invalid flags, which leads to a call of the BUG_ON() macro.
A local attacker can therefore use Transparent Huge Pages, in order to stop the system.Complete Vigil@nce bulletin....
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