CVE-2026-31536 CRITICAL

CVE-2026-31536: smb: server: let send_done handle a completion without IB_SEND_SIGNALED

Vendor Linux
Product Linux
Published April 24, 2026
Last update May 11, 2026

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

In the Linux kernel, the following vulnerability has been resolved: smb: server: let send_done handle a completion without IB_SEND_SIGNALED With smbdirect_send_batch processing we likely have requests without IB_SEND_SIGNALED, which will be destroyed in the final request that has IB_SEND_SIGNALED set. If the connection is broken all requests are signaled even without explicit IB_SEND_SIGNALED.

Key dates

02Disclosure timeline

April 24, 2026 CVE published
May 11, 2026 Record updated