CVE-2026-53261

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

devlink: Release nested relation on devlink free

devlink relation state is normally released from devlunregister(), which calls devlinkrelput(). This misses devlink instances that get a nested relation before registration and then fail probe before devlregister() is reached.

That flow can happen for SFs. The child devlink gets linked to its parent before registration, then a later probe error calls devlinkfree() directly. Since the instance was never registered, devlunregister() is not called and devlink->rel is leaked.

Release any pending relation from devlinkfree() as well. The registered path is unchanged because devlunregister() already clears devlink->rel before devlink_free() runs.