Medium 5.5Published Apr 24, 2026

CVE-2026-31537smb: server: make use of smbdirect_socket.send_io.bcredits

Updated under an hour ago (Oct 28, 2026, 12:30 AM ET)

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Exploited in the last 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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	0626e6641f6b467447c81dd7678a69c66f7746cf builds before 5ef18a2e66f2f33fdac64437bddfb9fe6389fdc7; from 0626e6641f6b467447c81dd7678a69c66f7746cf before 79242e7b6bc63efec28b7c235bc320806afce6c0; 0626e6641f6b467447c81dd7678a69c66f7746cf builds before 34abd408c8ba24d7c97bd02ba874d8c714f49db1	CNA record
linux linux_kernel linux:linux_kernel	from 5.15 before 6.18.11; from 6.19 before 6.19.1	NVD

References

References

https://git.kernel.org/stable/c/5ef18a2e66f2f33fdac64437bddfb9fe6389fdc7	patch
https://git.kernel.org/stable/c/79242e7b6bc63efec28b7c235bc320806afce6c0	patch
https://git.kernel.org/stable/c/34abd408c8ba24d7c97bd02ba874d8c714f49db1	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.