CVE-2009-2695 (http://nvd.nist.gov/nvd.cfm?cvename=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.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ab5a91a8364c3d6fc617abc47cc81d162c01d90a http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9c0d90103c7e0eb6e638e5b649e9f6d8d9c1b4b3 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8cf948e744e0218af604c32edecde10006dc8e9e http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=788084aba2ab7348257597496befcbccabdc98a3 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1d9959734a1949ea4f2427bd2d8b21ede6b2441c