CVE-2026-31537

smb: server: make use of smbdirect_socket.send_io.bcredits

CVE-2026-31537 is fixed in linux on 1 platform by DEBIAN-CVE-2026-31537 (version 6.18.12-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.1

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0012

1st percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
linux · Debian 14	6.18.12-1	DEBIAN-CVE-2026-31537	May 15, 2026

Details

Published
April 24, 2026
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31537

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