CVE-2026-74608

Description

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.

References

• https://git.kernel.org/stable/c/1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805
• https://git.kernel.org/stable/c/1ffacbadc14530e55b8d86f7b917524f6a0fb891
• https://git.kernel.org/stable/c/47dfac48bce7198ad4f1a388fc8c9491f878ac3b
• https://git.kernel.org/stable/c/4986410316b1ae0e63c6ce418e4eb196723626e7
• https://git.kernel.org/stable/c/64d7584e62ac8cdc750455c5fdc6008fc2de4f06