In the Linux kernel, the following vulnerability has been resolved:
smb: client: Fix use-after-free in cifs_try_adding_channels()
cifs_try_adding_channels() takes a temporary reference to an interface
before dropping iface_lock. If cifs_ses_add_channel() fails, it drops
that reference and then increments iface->weight_fulfilled. A concurrent interface list refresh can remove the list reference while
channel creation is in progress.
In that case, the failure-path
kref_put() releases the last reference and frees iface. Updating
weight_fulfilled afterward then accesses freed memory. Increment weight_fulfilled before dropping the temporary reference,
keeping iface alive for the final access.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No 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
References 6
https://git.kernel.org/stable/c/1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/1ffacbadc14530e55b8d86f7b917524f6a0fb891
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/47dfac48bce7198ad4f1a388fc8c9491f878ac3b
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/4986410316b1ae0e63c6ce418e4eb196723626e7
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/64d7584e62ac8cdc750455c5fdc6008fc2de4f06
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/c292d4686f717c03e5022fc4ae7c782f39a94915
416baaa9-dc9f-4396-8d5f-8c081fb06d67