Several high-risk bugs' patches haven't been applied on latest Ubuntu kernel.

[SyzScope]

Hi,

This is SyzScope, a research project that aims to reveal high-risk 
primitives from a seemingly low-risk bug (UAF/OOB read, WARNING, BUG, etc.).

We noticed that Ubuntu did a good jobs of applying patches from 
high-risk bugs(OOB/UAF write), but Ubuntu hasn't always applied patches 
from seemingly low-risk bugs.

However, some of those seemingly low-risk bugs are in fact high-risk bugs.

SyzScope discovered at least one high-risk primitive(memory 
write/func-ptr-deref) in the bugs below, their patches seems haven't 
been applied on Ubuntu -groovy.

Regrading the bug "KASAN: use-after-free Read in hci_send_acl" 
(https://syzkaller.appspot.com/bug?id=2e1943a94647f7732dd6fc60368642d6e8dc91b1), 
SyzScope reports 51 memory write primitives from this bug. The detailed 
comments can be found at 
https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-hci_send_acl

Regrading the bug "KASAN: use-after-free Read in cipso_v4_genopt" 
(https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e), 
SyzScope reports 6 memory write primitives from this bug. The detailed 
comments can be found at 
https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopt

Regrading the bug "KASAN: use-after-free Read in path_init (2)" 
(https://syzkaller.appspot.com/bug?id=a13951ba83ba7ba6e67fa8b504e8bc31f61616cb), 
SyzScope reports 86 memory write primitives from this bug. The detailed 
comments can be found at 
https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-path_init-2

These bugs above are a portion of our findings, we are happy to provide 
more if they benefit the Ubuntu community .

Please let us know if SyzScope indeed helps, and any suggestions/feedback.