HighFix available
ksmbd: unset conn->binding on failed binding request
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: ksmbd: unset conn->binding on failed binding request When a multichannel SMB2_SESSION_SETUP request with SMB2_SESSION_REQ_FLAG_BINDING fails ksmbd sets conn->binding = true but never clears it on the error path. This leaves the connection in a binding state where all subsequent ksmbd_session_lookup_all() calls fall back to the global sessions table. This fix it by clearing conn->binding = false in the error path.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.15.209, 6.1.167, 6.12.78, 6.18.20, 6.19.10, 6.6.130
- CVEs
- CVE-2026-31409
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 01:00 UTC · Revision 1
Source evidence
ksmbd: unset conn->binding on failed binding request
core-osv · Original sourcePublished 6 Apr 2026, 07:38 UTC
In the Linux kernel, the following vulnerability has been resolved: ksmbd: unset conn->binding on failed binding request When a multichannel SMB2_SESSION_SETUP request with SMB2_SESSION_REQ_FLAG_BINDING fails ksmbd sets conn->binding = true but never clears it on the error path. This leaves the connection in a binding state where all subsequent ksmbd_session_lookup_all() calls fall back to the global sessions table. This fix it by clearing conn->binding = false in the error path.
osv:CVE-2026-31409
Kernel
Fixed versions: 5.15.209, 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10
Complete source record
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"url": "https://osv.dev/vulnerability/CVE-2026-31409",
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"title": "ksmbd: unset conn->binding on failed binding request",
"summary": "In the Linux kernel, the following vulnerability has been resolved: ksmbd: unset conn->binding on failed binding request When a multichannel SMB2_SESSION_SETUP request with SMB2_SESSION_REQ_FLAG_BINDING fails ksmbd sets conn->binding = true but never clears it on the error path. This leaves the connection in a binding state where all subsequent ksmbd_session_lookup_all() calls fall back to the global sessions table. This fix it by clearing conn->binding = false in the error path.",
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"modified": "2026-10-28T02:30:41.164313310Z",
"provider": "osv",
"references": [
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"provider_metadata": {
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"related_cves": [
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
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"source_id": "core-osv",
"document_id": 508845,
"published_at": "2026-04-06T07:38:21.223+00:00"
}