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

Vulnerability from cvelistv5 – Published: 2026-04-06 07:38 – Updated: 2026-08-05 12:22
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
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < 7e8b270813079c785696bce8802a3f920665c88c (git)
Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < d073870dab8f6dadced81d13d273ff0b21cb7f4e (git)
Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < 6ebef4a220a1ebe345de899ebb9ae394206fe921 (git)
Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < 89afe5e2dbea6e9d8e5f11324149d06fa3a4efca (git)
Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < 9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772 (git)
Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < 6260fc85ed1298a71d24a75d01f8b2e56d489a60 (git)
Affected: f5a544e3bab78142207e0242d22442db85ba1eff , < 282343cf8a4a5a3603b1cb0e17a7083e4a593b03 (git)
Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
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 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "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."
        }
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            }
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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": "2026-08-05T12:22:18.697Z",
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This fix it by clearing\\nconn-\u003ebinding = false in the error path.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nksmbd: desestablecer conn -\u003e binding en una solicitud de enlace fallida\\n\\nCuando una solicitud SMB2_SESSION_SETUP multicanal con SMB2_SESSION_REQ_FLAG_BINDING falla, ksmbd establece conn -\u003e binding = true pero nunca lo borra en la ruta de error. Esto deja la conexi\u00f3n en un estado de enlace donde todas las llamadas posteriores a ksmbd_session_lookup_all() recurren a la tabla de sesiones global. 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:11:31+00:00",
      "cve": "CVE-2026-31409",
      "id": "CVE-2026-31409",
      "initial_release_date": "2026-04-06T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: unset conn-\u003ebinding on failed binding request",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31409.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-02T16:37:54Z",
      "cve": "CVE-2026-31409",
      "id": "CVE-2026-31409",
      "initial_release_date": "2026-04-06T23:25:04Z",
      "product_status:known_not_affected": "338",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31409",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31409.json",
      "version": "7"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.