PT-2026-51873 · Linux · Linux
Publicado
2026-06-24
·
Atualizado
2026-06-24
·
CVE-2026-52979
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In the Linux kernel, the following vulnerability has been resolved:
net: psp: check for device unregister when creating assoc
psp assoc device get locked() obtains a psp dev reference via
psp dev get for sock() (which uses psp dev tryget() under RCU);
it then acquires psd->lock and drops the reference. Before
the lock is taken, psp dev unregister() can run to completion:
take psd->lock, clear out state, unlock, drop the registration
reference.
The expectation is that the lock prevents device unregistration,
but much like with netdevs special care has to be taken when
"upgrading" a reference to a locked device. Add the missing
check if device is still alive. psp dev is registered() exists
already but had no callers, which makes me wonder if I either
forgot to add this or lost the check during refactoring...
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