CVE-2026-31539

Published: April 25, 2026Last modified: June 24, 2026

Description

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.

Severity score breakdown

Status

References

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