CVE-2026-53353

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the High-availability Seamless Redundancy (HSR) implementation where a warning is incorrectly triggered in the hsr addr is self() function. The problem occurs because hsr->self node is cleared in hsr del self node(), which is called by hsr dellink(). Since hsr dellink() is executed before unregister netdevice many(), a timing window is created where a user can still access the device while hsr->self node has already been cleared, leading to an erroneous WARN ONCE() trigger.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.