CVE-2026-89643

In the Linux kernel, the following vulnerability has been resolved:

audit: avoid dropping live tree ref on fsnotify rule autoremove

auditdelrule() is used for both netlink deletion templates and internal

fsnotify autoremove.  The former passes a parsed template which owns a

temporary tree reference; the latter passes the installed entry itself.

The unconditional auditputtree() at the end of auditdelrule() assumes

the template case.  For mixed AUDITDIR plus AUDITEXE rules, an fsnotify

autoremove event therefore drops the installed rule's live tree reference.

Repeating this across rules sharing the same tree can free the tree while

another rule still references it, and a later autoremove dereferences the

freed pathname while comparing rules.

Move the temporary-tree put to auditrulechange(), the caller that owns

deletion templates.  Keep it in the AUDITDELRULE cleanup so both

successful deletion and -ENOENT still release the parser-owned tree.

[PM: dropped unnecessary comment for line length reasons]