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

ksmbd: fix use-after-free in same_client_has_lease()

same_client_has_lease() returns an opinfo pointer from ci->m_op_list
after dropping ci->m_lock without taking a reference.

smb_grant_oplock() then dereferences that pointer in copy_lease() and
when checking breaking_cnt. A concurrent close can remove the old lease
from ci->m_op_list and drop the last reference before the caller uses
the returned pointer, leading to a use-after-free.

Take a reference when same_client_has_lease() selects an existing lease,
drop any previous match while scanning, and release the returned
reference in smb_grant_oplock() after copying the lease state.

https://git.kernel.org/stable/c/09634cd055d9bd8dd167995ea52bcd8028dd5dac

https://git.kernel.org/stable/c/0ff82a9cf9312678d8bc4edeef0b6e82659ac12a

https://git.kernel.org/stable/c/35d3d6ff2bc1e7aaecb15d5377ebbd6227acae0d

https://git.kernel.org/stable/c/65b655f65c3ca1ab5d598d3832bb0ff531725858

https://git.kernel.org/stable/c/79c7c59bb519db6f5a2a151965e825ec725614cc

https://git.kernel.org/stable/c/7c3264d273d524aa6adcce23c01087271f13586f

https://git.kernel.org/stable/c/aaa3bb2bbf2ccbfea9e4e0b9dabf3afc60b50cd0

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