Linux Kernel callchain.c perf_callchain_user_64 denial of service

A vulnerability has been found in Linux Kernel (the affected version is unknown) and classified as critical. This vulnerability affects the function perf_callchain_user_64 of the file arch/powerpc/perf/callchain.c. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published 4 months after the disclosure of the vulnerability.