The tpm_open function in drivers/char/tpm/tpm.c in the Linux kernel before 2.6.39 does not initialize a certain buffer, which allows local users to obtain potentially sensitive information from kernel memory via unspecified vectors.
ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=1309d7afbed112f0e8e90be9af975550caa0076b
www.openwall.com/lists/oss-security/2011/03/15/13
bugzilla.redhat.com/show_bug.cgi?id=684671
github.com/torvalds/linux/commit/1309d7afbed112f0e8e90be9af975550caa0076b