The announcement is here: https://www.cisco.com/c/en/us/products/collateral/security/email-security-appliance/email-security-x95-hardware-appliance-eol.html
Asyncos used to be FreeBSD based, is the AsyncOS 11 Linux based?The bug report says:121 | Linux kernel panic: page fault122 | Linux kernel panic: db_trace_se124 | Linux kernel panic: 43