$ for pid in $(pidof qemu-system-x86_64); do echo PID $pid; for task in 
/proc/$pid/task/*; do cat $task/status | grep Secc; done; done
PID 21066
Seccomp:        2
Seccomp:        0
Seccomp:        2
Seccomp:        2
Seccomp:        2
Seccomp:        2
Seccomp:        2
Seccomp:        2

$ sudo apt-get update && sudo apt-get dist-upgrade -V
...
The following packages will be upgraded:
   qemu-block-extra (1:2.11+dfsg-1ubuntu7.4 => 1:2.11+dfsg-1ubuntu7.7~ppa1)
   qemu-kvm (1:2.11+dfsg-1ubuntu7.4 => 1:2.11+dfsg-1ubuntu7.7~ppa1)
   qemu-system-common (1:2.11+dfsg-1ubuntu7.4 => 1:2.11+dfsg-1ubuntu7.7~ppa1)
   qemu-system-x86 (1:2.11+dfsg-1ubuntu7.4 => 1:2.11+dfsg-1ubuntu7.7~ppa1)
   qemu-utils (1:2.11+dfsg-1ubuntu7.4 => 1:2.11+dfsg-1ubuntu7.7~ppa1)
5 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
...

$ for pid in $(pidof qemu-system-x86_64); do echo PID $pid; for task in 
/proc/$pid/task/*; do cat $task/status | grep Secc; done; done
PID 29666
Seccomp:        2
Seccomp:        2
Seccomp:        2
Seccomp:        2
Seccomp:        2
Seccomp:        2

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https://bugs.launchpad.net/bugs/1789551

Title:
  qemu: CVE-2018-15746: seccomp: blacklist is not applied to all threads

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