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.
| Version | Score | Severity | Vector String |
|---|---|---|---|
| 3.0 | 4.4 | Medium | CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N |
| Product | Vendor | Version |
|---|---|---|
| security | kernel | < 16.0.14931.20612 |