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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, shiftfs_btrfs_ioctl_fd_replace() calls fdget(oldfd), then without further checks passes the resulting file* into shiftfs_real_fdget(), which casts file->private_data, a void* that points to a filesystem-dependent type, to a "struct shiftfs_file_info *". As the private_data is not required to be a pointer, an attacker can use this to cause a denial of service or possibly execute arbitrary code.
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|