Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before aaa3bb2bbf2ccbfea9e4e0b9dabf3afc60b50cd0; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 09634cd055d9bd8dd167995ea52bcd8028dd5dac; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 7c3264d273d524aa6adcce23c01087271f13586f; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 79c7c59bb519db6f5a2a151965e825ec725614cc; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 35d3d6ff2bc1e7aaecb15d5377ebbd6227acae0d; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 0ff82a9cf9312678d8bc4edeef0b6e82659ac12a; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 65b655f65c3ca1ab5d598d3832bb0ff531725858 |
| Linux / Linux | affected 5.15; unaffected 0 before 5.15; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/aaa3bb2bbf2ccbfea9e4e0b9dabf3afc60b50cd0
- https://git.kernel.org/stable/c/09634cd055d9bd8dd167995ea52bcd8028dd5dac
- https://git.kernel.org/stable/c/7c3264d273d524aa6adcce23c01087271f13586f
- https://git.kernel.org/stable/c/79c7c59bb519db6f5a2a151965e825ec725614cc
- https://git.kernel.org/stable/c/35d3d6ff2bc1e7aaecb15d5377ebbd6227acae0d
- https://git.kernel.org/stable/c/0ff82a9cf9312678d8bc4edeef0b6e82659ac12a
- https://git.kernel.org/stable/c/65b655f65c3ca1ab5d598d3832bb0ff531725858