A security flaw was found in the Linux kernel that
there is a way to arbitrary change zero page memory. Zero page is a page
which kernel maps into virtual address space on read page fault if the
page was not allocated before. Kernel has one zero page which used
everywhere. Programs that map 0 page are affected and code execution can
be gained. Upon running the exploit the system may become unusable as the
linker memory pages gets tainted. Furthermore, if the right code is put
in the 0 page, code execution is possible.
Name: Kirill A. Shutemov (Intel)
This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5. This has been rated as having Low security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.