CVE-2026-31539

Summary

In the Linux kernel, the following vulnerability has been resolved:

smb: smbdirect: introduce smbdirect_socket.recv_io.credits.available

The logic off managing recv credits by counting posted recv_io and granted credits is racy.

That's because the peer might already consumed a credit, but between receiving the incoming recv at the hardware and processing the completion in the 'recv_done' functions we likely have a window where we grant credits, which don't really exist.

So we better have a decicated counter for the available credits, which will be incremented when we posted new recv buffers and drained when we grant the credits to the peer.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/e811e60e1cc79923c4388146eb1fa26a7482731e
• https://git.kernel.org/stable/c/f99996870222b598914a1f49d7375dc23752c237
• https://git.kernel.org/stable/c/6e3c5052f9686192e178806e017b7377155f4bab

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