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Bug 283821 (CVE-2009-2695) - Kernel: mmap-to-zero-page bypass (CVE-2009-2695)
Summary: Kernel: mmap-to-zero-page bypass (CVE-2009-2695)
Alias: CVE-2009-2695
Product: Gentoo Security
Classification: Unclassified
Component: Kernel (show other bugs)
Hardware: All Linux
: High normal (vote)
Assignee: Gentoo Security
Whiteboard: [linux <2.6.31]
Depends on:
Reported: 2009-09-06 09:46 UTC by Alex Legler (RETIRED)
Modified: 2013-09-15 18:42 UTC (History)
2 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description Alex Legler (RETIRED) archtester gentoo-dev Security 2009-09-06 09:46:58 UTC
CVE-2009-2695 (
  The Linux kernel before 2.6.31-rc7 does not properly prevent mmap
  operations that target page zero and other low memory addresses,
  which allows local users to gain privileges by exploiting NULL
  pointer dereference vulnerabilities, related to (1) the default
  configuration of the allow_unconfined_mmap_low boolean in SELinux on
  Red Hat Enterprise Linux (RHEL) 5, (2) an error that causes
  allow_unconfined_mmap_low to be ignored in the unconfined_t domain,
  (3) lack of a requirement for the CAP_SYS_RAWIO capability for these
  mmap operations, and (4) interaction between the mmap_min_addr
  protection mechanism and certain application programs.