KPTI is the kernel page-table isolation hardening feature in the Linux kernel to mitigate the Meltdown security vulnerability in Intel and other CPUs. KPTI may also refer to: KPTI (FM), the 2004–2009 callsign of the radio station KXXF, licensed to the city of Winnie, Texas, US KREV (FM), a radio station with the callsign KPTI (2002–2004), serving the greater San Francisco Bay Area, California, US Karyopharm Therapeutics (NASDAQ: KPTI), in the NASDAQ Biotechnology Index See also KTPI (disambiguation)