Not sure wether this was already reported: Linux kernel 2.6.x before 2.6.20 allows local users to read unreadable binaries by using the interpreter (PT_INTERP) functionality and triggering a core dump, a variant of CVE-2004-1073.
proposed metadata: [linux < 2.6.20] 1fb844961818ce94e782acf6a96b92dc2303553b http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.20 [gp < 2.6.20-1]