EUVD-2026-25428
GHSA-4w64-3hfc-pgqc
CVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
smb: client: make use of 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.
AnalysisAI
A race condition in the Linux kernel SMB client's recv_io credit management allows local authenticated users to cause a denial of service through timing-sensitive credit accounting between incoming data reception and completion processing. The vulnerability affects SMBDirect socket credit handling where credits may be granted to peers before corresponding recv buffers are actually posted, creating a window where credit accounting becomes inconsistent. …
Sign in for full analysis, threat intelligence, and remediation guidance.
Share
External POC / Exploit Code
Leaving vuln.today