Description: CAN BCM local privilege escalation
References:
 https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.md
 https://www.openwall.com/lists/oss-security/2021/06/19/1
 https://lore.kernel.org/netdev/20210619161813.2098382-1-cascardo@canonical.com/
Notes:
Bugs:
upstream: released (5.14-rc1) [d5f9023fa61ee8b94f37a93f08e94b136cf1e463]
5.10-upstream-stable: released (5.10.50) [b52e0cf0bfc1ede495de36aec86f6013efa18f60]
4.19-upstream-stable: released (4.19.198) [eabe65197876e4a0906eab784f5766c4c76098c7]
4.9-upstream-stable: released (4.9.276) [545914a9f926b8b6c9193cdee352c1fa70e6df18]
sid: released (5.10.46-1) [bugfix/all/can-bcm-delay-release-of-struct-bcm_op-after-synchro.patch]
4.19-buster-security: released (4.19.194-3) [bugfix/all/can-bcm-delay-release-of-struct-bcm_op-after-synchro.patch]
4.9-stretch-security: released (4.9.272-2) [bugfix/all/can-bcm-delay-release-of-struct-bcm_op-after-synchro.patch]