Yes it's clearly something new as the MSDN docs for Bug Check 0x139: KERNEL_SECURITY_CHECK_FAILURE state that parameter 1 contains the type of corruption.

WinDbg shows Arg1: 000000000000003b, Type of memory safety violation

However the table on the MSDN page doesn't list any types beyond 39.

EXCEPTION_RECORD:  fffff8024e270d68 -- (.exr 0xfffff8024e270d68)

ExceptionAddress: fffff8024b5d2be1 (nt!KiInterruptSubDispatchNoLockNoEtw+0x0000000000000121)

   ExceptionCode: c0000409 (Security check failure or stack buffer overrun)

  ExceptionFlags: 00000001

NumberParameters: 1

   Parameter[0]: 000000000000003b

Subcode: 0x3b (unknown subcode)

CPU_COUNT: 8

CPU_MHZ: af8

CPU_VENDOR:  GenuineIntel

CPU_FAMILY: 6

CPU_MODEL: 9e

CPU_STEPPING: 9

CPU_MICROCODE: 6,9e,9,0 (F,M,S,R)  SIG: 8E'00000000 (cache) 8E'00000000 (init)

BLACKBOXBSD: 1 (!blackboxbsd)

BLACKBOXPNP: 1 (!blackboxpnp)

DEFAULT_BUCKET_ID:  CODE_CORRUPTION

BUGCHECK_STR:  0x139

PROCESS_NAME:  vmware-vmx.exe

CURRENT_IRQL:  d

WATSON_BKT_EVENT:  BEX

ERROR_CODE: (NTSTATUS) 0xc0000409 - The system detected an overrun of a stack-based buffer in this application. This overrun could potentially allow a malicious user to gain control of this application.

EXCEPTION_CODE: (NTSTATUS) 0xc0000409 - The system detected an overrun of a stack-based buffer in this application. This overrun could potentially allow a malicious user to gain control of this application.

EXCEPTION_CODE_STR:  c0000409

EXCEPTION_PARAMETER1:  000000000000003b

ANALYSIS_SESSION_HOST:  MYMACHINE

ANALYSIS_SESSION_TIME:  12-19-2018 00:11:56.0247

ANALYSIS_VERSION: 10.0.17134.12 amd64fre

LAST_CONTROL_TRANSFER:  from fffff8024b5e2fa9 to fffff8024b5d10a0

STACK_TEXT: 

fffff802`4e270ae8 fffff802`4b5e2fa9 : 00000000`00000139 00000000`0000003b fffff802`4e270e10 fffff802`4e270d68 : nt!KeBugCheckEx

fffff802`4e270af0 fffff802`4b5e33d0 : 00000000`00000004 fffff802`4e270cb0 fffff802`4e270cb0 fffff802`598328c4 : nt!KiBugCheckDispatch+0x69

fffff802`4e270c30 fffff802`4b5e175f : 00000000`00000000 00000000`00000000 00000000`00000018 ffff848b`b4d0b8c0 : nt!KiFastFailDispatch+0xd0

fffff802`4e270e10 fffff802`4b5d2be1 : 00000000`00000000 00000000`00000000 fffff802`4bf07cb0 ffff8108`1b97f280 : nt!KiRaiseSecurityCheckFailure+0x31f

fffff802`4e270fa8 00000000`000004e1 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KiInterruptSubDispatchNoLockNoEtw+0x121

00000000`00000000 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : 0x4e1