UNKNOWN NVD
CVE-2026-72492
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 op
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.
References
- 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
This unknown severity vulnerability was published on 2026-08-15 via NVD.
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