Description: Rogue backends can cause DoS of guests via high frequency events (netfront)
References:
 https://xenbits.xen.org/xsa/advisory-391.html
 https://xenbits.xen.org/xsa/xsa391-linux-2.patch
Notes:
 carnil> Fixed as well in 5.15.11 for 5.15.y.
Bugs:
upstream: released (5.16-rc7) [b27d47950e481f292c0a5ad57357edb9d95d03ba]
5.10-upstream-stable: released (5.10.88) [d31b3379179d64724d3bbfa87bd4ada94e3237de]
4.19-upstream-stable: released (4.19.222) [3559ca594f15fcd23ed10c0056d40d71e5dab8e5]
4.9-upstream-stable: released (4.9.294) [99120c8230fdd5e8b72a6e4162db9e1c0a61954a]
sid: released (5.15.15-1)
5.10-bullseye-security: released (5.10.92-1)
4.19-buster-security: released (4.19.232-1)
4.9-stretch-security: released (4.9.303-1)