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Linux Kernel 64-Bit SMP Routing_ioctl() Local Denial of Service Vulnerability

A local denial-of-service vulnerability affects the Linux kernel on 64-bit Symmetric Multi-Processor (SMP) platforms.

Specifically, the vulnerability presents itself due to an omitted call to the 'sockfd_put()' function in the 32-bit-compatible 'routing_ioctl()' function.

The 32-bit-compatible 'tiocgdev ioctl()' function on x86-64 platforms is affected by this issue as well.