CVE-2026-52979

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: psp: check for device unregister when creating assoc<br /> <br /> psp_assoc_device_get_locked() obtains a psp_dev reference via<br /> psp_dev_get_for_sock() (which uses psp_dev_tryget() under RCU);<br /> it then acquires psd-&gt;lock and drops the reference. Before<br /> the lock is taken, psp_dev_unregister() can run to completion:<br /> take psd-&gt;lock, clear out state, unlock, drop the registration<br /> reference.<br /> <br /> The expectation is that the lock prevents device unregistration,<br /> but much like with netdevs special care has to be taken when<br /> "upgrading" a reference to a locked device. Add the missing<br /> check if device is still alive. psp_dev_is_registered() exists<br /> already but had no callers, which makes me wonder if I either<br /> forgot to add this or lost the check during refactoring...