CVE-2009-1897 Information

Description

The tun_chr_poll function in drivers/net/tun.c in the tun subsystem in the Linux kernel 2.6.30 and 2.6.30.1 when the -fno-delete-null-pointer-checks gcc option is omitted allows local users to gain privileges via vectors involving a NULL pointer dereference and an mmap of /dev/net/tun a different vulnerability than CVE-2009-1894.

Reference

http://archives.neohapsis.com/archives/fulldisclosure/2009-07/0241.html http://archives.neohapsis.com/archives/fulldisclosure/2009-07/0246.html http://article.gmane.org/gmane.linux.network/124939 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3c8a9c63d5fd738c261bd0ceece04d9c8357ca13 http://grsecurity.net/~spender/cheddar_bay.tgz http://isc.sans.org/diary.html?storyid=6820 http://lkml.org/lkml/2009/7/6/19 http://secunia.com/advisories/35839 http://www.openwall.com/lists/oss-security/2009/07/17/1 http://www.vupen.com/english/advisories/2009/1925 https://bugzilla.redhat.com/show_bug.cgi?id=512284 https://exchange.xforce.ibmcloud.com/vulnerabilities/51803 https://www.redhat.com/en/blog/security-flaws-caused-compiler-optimizations