Riskcovery

CVE-2026-31539

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

State
Published
Severity
7.5 High
Published
Apr 24, 2026
Updated
Oct 19, 2026
Reserved
Mar 9, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLinux

Weaknesses

  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

ProductVersions
LinuxLinux
  • 5fb9b459b3686e366640edd4e62805ef7b4de927 to before e811e60e1cc79923c4388146eb1fa26a7482731eAffected
  • 5fb9b459b3686e366640edd4e62805ef7b4de927 to before f99996870222b598914a1f49d7375dc23752c237Affected
  • 5fb9b459b3686e366640edd4e62805ef7b4de927 to before 6e3c5052f9686192e178806e017b7377155f4babAffected
LinuxLinux
  • 6.18Affected
  • before 6.18Not affected
  • 6.18.11 through 6.18.*Not affected
  • 6.19.1 through 6.19.*Not affected
  • 7.0 and laterNot affected

References

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