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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Vulnerable Products 7
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
5.15
|
5.15.212
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
5.15
|
6.1.178
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
5.15
|
6.6.145
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
5.15
|
6.12.97
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
5.15
|
6.18.40
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
5.15
|
7.1.5
|
|
Linux Linux_Kernel
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
|
5.15
|
7.2-rc1
|
References 7
https://git.kernel.org/stable/c/aaa3bb2bbf2ccbfea9e4e0b9dabf3afc60b50cd0
NVD
https://git.kernel.org/stable/c/09634cd055d9bd8dd167995ea52bcd8028dd5dac
NVD
https://git.kernel.org/stable/c/7c3264d273d524aa6adcce23c01087271f13586f
NVD
https://git.kernel.org/stable/c/79c7c59bb519db6f5a2a151965e825ec725614cc
NVD
https://git.kernel.org/stable/c/35d3d6ff2bc1e7aaecb15d5377ebbd6227acae0d
NVD
https://git.kernel.org/stable/c/0ff82a9cf9312678d8bc4edeef0b6e82659ac12a
NVD
https://git.kernel.org/stable/c/65b655f65c3ca1ab5d598d3832bb0ff531725858
NVD