Description: Userland can sometimes prevent handling of an NMI on x86_64
References: https://marc.info/?l=oss-security&m=143758877425647&w=2
Notes:
 Probably introduced by commit 3f3c8b8c4b2a in 3.3.
Bugs:
upstream: released (4.2-rc3) [0b22930ebad563ae97ff3f8d7b9f12060b4c6e6b, a27507ca2d796cfa8d907de31ad730359c8a6d06, 810bc075f78ff2c221536eb3008eac6a492dba2d]
3.16-upstream-stable: released (3.16.7-ckt16)
3.2-upstream-stable: N/A ("Vulnerable code not present)
2.6.32-upstream-stable: N/A ("Vulnerable code not present)
sid: released (4.0.8-2)
3.16-jessie-security: released (3.16.7-ckt11-1+deb8u2)
3.2-wheezy-security: N/A ("Vulnerable code not present)
2.6.32-squeeze-security: N/A ("Vulnerable code not present)