smb multichannel

About this tag
SMB Multichannel is a feature of the SMB protocol that allows multiple network paths to be used simultaneously between a client and server, increasing throughput and resilience. On Windows 11, it can aggregate bandwidth across Wi-Fi and Ethernet for faster local file transfers, though reliable performance depends on hardware and driver configuration. A recent Linux kernel vulnerability, CVE-2025-37750, highlights a use-after-free bug triggered when SMB Multichannel is used with encrypted transfers, caused by reusing crypto state across channels. This can lead to kernel crashes and denial of service in high-concurrency workloads. The feature is part of modern SMB 3.x, which also includes encryption, signing, SMB Direct (RDMA), and SMB over QUIC, replacing legacy CIFS/SMBv1.

  1. Linux SMB Multichannel UAF CVE-2025-37750: Fixes and Mitigations

    A recently disclosed Linux-kernel vulnerability, tracked as CVE-2025-37750, fixes a kernel use‑after‑free (UAF) that can be triggered when SMB multichannel is used with encrypted transfers; the bug arises from reusing crypto AEAD state across channels and manifests as KASAN-detected slab UAFs...
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    • kasan linux kernel memory safety smb multichannel
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    • Forum: Security Alerts

  2. Windows 11 SMB Multichannel: Tie Wi Fi and Ethernet for Faster Local Transfers

    When a simple file copy suddenly becomes a multi‑gigabit sprint, it's usually because two things finally line up: the network hardware can carry the traffic, and the protocol stack is using every available path. Recent experiments showing how to combine Wi‑Fi and Ethernet on Windows 11 to...
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    • samba smb multichannel wifi ethernet aggregation windows networking
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    • Forum: Windows News

  3. From CIFS to SMB 3.x: Modern, Secure File Sharing for 2025

    CIFS is not a modern alternative to SMB — it’s the 1996 dialect of SMB 1.0, and continuing to treat CIFS as a current protocol in 2025 leaves organizations exposed to well-known security flaws and performance shortfalls. The choice for any Windows-heavy network today is not “CIFS vs SMB” as if...
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    • cifs encryption file sharing kerberos macos smb preauthentication integrity rdma samba security smb smb 3.1.1 smb direct smb multichannel smb over quic smbv1 tls wan performance windows server
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    • Forum: Windows News