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In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, several locations which shift ids translate user/group ids before performing operations in the lower filesystem were translating them into init_user_ns, whereas they should have been translated into the s_user_ns for the lower filesystem. This resulted in using ids other than the intended ones in the lower fs, which likely did not map into the shifts s_user_ns. A local attacker could use this to possibly bypass discretionary access control permissions.
Base Score: 4.6
Impact Score: 6.4
Exploitability Score: 3.9
Base Score: 8.8
Impact Score: 6
Exploitability Score: 2
|131012||Ubuntu 18.04 LTS / 19.04 : Linux kernel vulnerability and regression (USN-4184-2)||Nessus||Ubuntu Local Security Checks|
|131011||Ubuntu 19.10 : Linux kernel vulnerability (USN-4183-2)||Nessus||Ubuntu Local Security Checks|
|130964||Ubuntu 18.04 LTS / 19.04 : Linux kernel vulnerabilities (USN-4184-1)||Nessus||Ubuntu Local Security Checks|
|130963||Ubuntu 19.10 : Linux kernel vulnerabilities (USN-4183-1)||Nessus||Ubuntu Local Security Checks|