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.
https://bugzilla.redhat.com/show_bug.cgi?id=2060795
http://packetstormsecurity.com/files/166229/Dirty-Pipe-Linux-Privilege-Escalation.html
http://packetstormsecurity.com/files/166230/Dirty-Pipe-SUID-Binary-Hijack-Privilege-Escalation.html
http://packetstormsecurity.com/files/166258/Dirty-Pipe-Local-Privilege-Escalation.html
https://www.suse.com/support/kb/doc/?id=000020603
https://security.netapp.com/advisory/ntap-20220325-0005/
https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2022-0015
Source: MITRE
Published: 2022-03-10
Updated: 2022-12-09
Type: CWE-665
Base Score: 7.2
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 3.9
Severity: HIGH
Base Score: 7.8
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.8
Severity: HIGH