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Date: Wed, 20 Feb 2013 01:40:18 +0100
From: Petr Matousek <>
Cc: Kurt Seifried <>
Subject: CVE request -- Linux kernel: mm: thp: pmd_present and PROT_NONE
 local DoS

Most VM places are using pmd_none but a few are still using pmd_present.
The meaning is about the same for the pmd. However pmd_present would
return the wrong value on PROT_NONE ranges. When the code using
pmd_present gets a false negative, the kernel will crash.

An unprivileged local user could use this flaw to crash the system.

Upstream fix:;a=commit;h=027ef6c8


Petr Matousek / Red Hat Security Response Team

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