A flaw was 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.
Moxa is investigating to determine if any of our products are affected by this vulnerability. At the time of publication, none of Moxa’s products are affected.
Moxa's Product Security Incident Response Team (PSIRT) will keep monitoring the situation and if there are any updates to the status of the vulnerability that affects Moxa's products, we will provide an update immediately.