Bug 2461539 (CVE-2026-31536)

Summary: CVE-2026-31536 kernel: smb: server: let send_done handle a completion without IB_SEND_SIGNALED
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's Server Message Block (SMB) direct server implementation. This issue occurs during `smbdirect_send_batch` processing where requests without the `IB_SEND_SIGNALED` flag may be incorrectly handled when a connection is broken. This could lead to unexpected behavior related to request completion and resource management within the SMB server.
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Description OSIDB Bzimport 2026-04-24 15:07:21 UTC 
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.
Comment 1 Keith Grant 2026-04-24 16:27:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026042433-CVE-2026-31536-d7cc@gregkh/T