Linux Kernel Privilege Escalation Vulnerability – Dirty Pipe  [CVE-2022-0847]

CVE number = CVE-2022-0847

A flaw has been found in the way the “flags” member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe and push_pipe functions in the Linux kernel and could thus contain stale values.

An unprivileged local user could use this flaw to write to pages in the page cache backed by read only files and as such escalate their privileges on the system.

The bug is quite easy to exploit, but it can’t be done remotely. Attackers need to have prior access to a vulnerable host to deploy an exploit.

If you use Linux you should check to see if you are affected and apply any patches as soon as possible.

This flaw was discovered by security researcher Max Kellermann.