CVE-2026-31537: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: smb: server: make use of smbdirect_socket.send_io.bcredits It turns out that our code will corrupt the stream of reassabled data transfer messages when we trigger an immendiate (empty) send. In order to fix this we'll have a single 'batch' credit per connection. And code getting that credit is free to use as much messages until remaining_length reaches 0, then the batch credit it given back and the next logical send can happen.

Affected products

• Linux Linux Kernel: from 5.15, before 6.18.11 (fixed in 6.18.11); from 6.19, before 6.19.1 (fixed in 6.19.1)

Published 2026-04-24. Last modified 2026-06-17.