CVE-2020-25221

A flaw was found in the get_gate_page in mm/gup.c in the Linux kernel, where it allows privilege escalation due to incorrect reference counting (caused by gate page mishandling) of the struct page that backs the vsyscall page. The result is a refcount underflow. This flaw is triggered by any 64-bit process that can use ptrace() or process_vm_readv(). The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.