permission denied when executing an elf payload

Question

I can examine a payload using libemu (sctest) and ndisasm, like this :

msfvenom -p linux/x86/shell_bind_tcp -f raw | ./sctest -vvv -Ss 1000

msfvenom -p linux/x86/shell_bind_tcp -f raw | ndisasm -u -

And I'd also like to debug the payload with gdb.

So I create an elf executable :

msfvenom -p linux/x86/shell_bind_tcp -a x86 --platform linux -f elf > payloadexec

But running the payloadexec leads to permission denied.

./payloadexec
bash: ./payloadexec: Permission denied