Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: server: 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. This fixes regression Namjae reported with the 6.18 release.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.18, < 6.18.11 |
References
- https://git.kernel.org/stable/c/26ad87a2cfb8c1384620d1693a166ed87303046ePatch
- https://git.kernel.org/stable/c/66c082e3d4651e8629a393a9e182b01eb50fb0a3Patch
- https://git.kernel.org/stable/c/809cbd31aa4f87a1b889532244c9cf30eb022385Patch
FAQ
What is CVE-2026-31538?
CVE-2026-31538 is a vulnerability with a CVSS score of 7.5 (HIGH). In the Linux kernel, the following vulnerability has been resolved: smb: server: make use of smbdirect_socket.recv_io.credits.available The logic off managing recv credits by counting posted recv_io...
How severe is CVE-2026-31538?
CVE-2026-31538 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31538?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.