The MITRE CVE dictionary describes this issue as:
Linux kernel 2.4.x and 2.6.x up to 2.6.16 allows local users to bypass IPC permissions and modify a readonly attachment of shared memory by using mprotect to give write permission to the attachment. NOTE: some original raw sources combined this issue with CVE-2006-1524, but they are different bugs.
Find out more about CVE-2006-2071 from the
MITRE CVE dictionary dictionary and