Gr4 CVE-2025-36899
Gr4 All the info seems to be there
As far as I could see, details about this vulnerability aren't published yet. The info you quoted, as you quoted:
Gr4 There is a possible escalation of privilege due to test/debugging code left in a production build. This could lead to physical escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
Is the only public info I could find about it. It's part of the severity assessment and classification of the vulnerability. The actual details aren't public yet, it seems. When they'd become public, the Pixel Update Bulletin in the link I provided should be updated with links to source code commits and such stuff. Beyond seeing the actual fix itself, you could see which source code file(s) were fixed, and the comment describing the fix.