CVE-2026-31409 (GCVE-0-2026-31409)

Vulnerability from cvelistv5 – Published: 2026-04-06 07:38 – Updated: 2026-04-06 07:38
VLAI?
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d073870dab8f6dadced81d13d273ff0b21cb7f4e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6ebef4a220a1ebe345de899ebb9ae394206fe921 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 89afe5e2dbea6e9d8e5f11324149d06fa3a4efca (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6260fc85ed1298a71d24a75d01f8b2e56d489a60 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 282343cf8a4a5a3603b1cb0e17a7083e4a593b03 (git)
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    Linux Linux Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc5 , ≤ * (original_commit_for_fix)
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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.20",
              "versionType": "semver"
            },
            {
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              "version": "6.19.10",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.0-rc5",
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            }
          ]
        }
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      "cpeApplicability": [
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          "nodes": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: unset conn-\u003ebinding on failed binding request\n\nWhen a multichannel SMB2_SESSION_SETUP request with\nSMB2_SESSION_REQ_FLAG_BINDING fails ksmbd sets conn-\u003ebinding = true\nbut never clears it on the error path. This leaves the connection in\na binding state where all subsequent ksmbd_session_lookup_all() calls\nfall back to the global sessions table. This fix it by clearing\nconn-\u003ebinding = false in the error path."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-06T07:38:21.223Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/6260fc85ed1298a71d24a75d01f8b2e56d489a60"
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          "url": "https://git.kernel.org/stable/c/282343cf8a4a5a3603b1cb0e17a7083e4a593b03"
        }
      ],
      "title": "ksmbd: unset conn-\u003ebinding on failed binding request",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31409",
    "datePublished": "2026-04-06T07:38:21.223Z",
    "dateReserved": "2026-03-09T15:48:24.087Z",
    "dateUpdated": "2026-04-06T07:38:21.223Z",
    "state": "PUBLISHED"
  },
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  }
}


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