The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.
In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, shiftfs_btrfs_ioctl_fd_replace() installs an fd referencing a file from the lower filesystem without taking an additional reference to that file. After the btrfs ioctl completes this fd is closed, which then puts a reference to that file, leading to a refcount underflow.
Base Score: 4.6
Impact Score: 6.4
Exploitability Score: 3.9
Base Score: 7.8
Impact Score: 5.9
Exploitability Score: 1.8
|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|