Description: Race condition in Linux event handler may crash dom0
References:
 https://xenbits.xen.org/xsa/advisory-331.html
Notes:
 carnil> Fixed in 5.9.5.
Bugs:
upstream: released (5.10-rc1) [073d0552ead5bfc7a3a9c01de590e924f11b5dd2]
4.19-upstream-stable: released (4.19.155) [61d359d51a1cce8a5913843c8c3601dc878cc519]
4.9-upstream-stable: released (4.9.244) [e4ccd4b1a6e586659005a231e793af325e575e53]
sid: released (5.9.6-1)
4.19-buster-security: released (4.19.160-1)
4.9-stretch-security: released (4.9.246-1)