CVE-2004-2536 Information

Description

The exit_thread function (process.c) in Linux kernel 2.6 through 2.6.5 does not invalidate the per-TSS io_bitmap pointers if a process obtains IO access permissions from the ioperm function but does not drop those permissions when it exits which allows other processes to access the per-TSS pointers access restricted memory locations and possibly gain privileges.

Reference

http://secunia.com/advisories/11577 http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.6 http://www.osvdb.org/5997 http://www.securityfocus.com/bid/10302 http://www.ussg.iu.edu/hypermail/linux/kernel/0405.0/1242.html http://www.ussg.iu.edu/hypermail/linux/kernel/0405.0/1265.html https://exchange.xforce.ibmcloud.com/vulnerabilities/16106