Multiple drivers in Linux kernel 2.4.19 and earlier do not properly mark memory with the VM_IO flag, which causes incorrect reference counts and may lead to a denial of service (kernel panic) when accessing freed kernel pages.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11474
https://exchange.xforce.ibmcloud.com/vulnerabilities/19275
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=137821
http://www.securityfocus.com/bid/12338
http://www.redhat.com/support/errata/RHSA-2006-0140.html
http://www.redhat.com/support/errata/RHSA-2005-017.html
http://www.redhat.com/support/errata/RHSA-2005-016.html
http://www.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.23aa3/00_VM_IO-4