It was discovered in the Linux kernel before 4.11-rc8 that root can gain direct access to an internal keyring, such as '.dns_resolver' in RHEL-7 or '.builtin_trusted_keys' upstream, by joining it as its session keyring. This allows root to bypass module signature verification by adding a new public key of its own devising to the keyring.
5.13.0-19.195.3.0-18.195.3.0-24.265.4.0-9.126.5.0-9.96.8.0-31.314.2.0-16.194.2.0-17.214.2.0-19.234.3.0-1.104.3.0-2.114.3.0-5.164.3.0-6.174.3.0-7.184.4.0-10.254.4.0-11.26+42 more4.4.0-79.1003.11.0-12.193.12.0-1.33.12.0-2.53.12.0-2.73.12.0-3.83.12.0-3.93.12.0-4.103.12.0-4.123.12.0-5.133.12.0-7.15+110 more3.13.0-132.1814.13.0-16.195.13.0-1005.64.4.0-1002.24.4.0-1001.104.4.0-1003.124.4.0-1004.134.4.0-1007.164.4.0-1009.184.4.0-1011.204.4.0-1012.214.4.0-1013.224.4.0-1016.254.4.0-1017.264.4.0-1018.27Exploitability
AV:LAC:LPR:HUI:NScope
S:UImpact
C:NI:HA:NCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N