{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "f5a544e3bab78142207e0242d22442db85ba1eff"
            },
            {
              "fixed": "7e8b270813079c785696bce8802a3f920665c88c"
            },
            {
              "fixed": "d073870dab8f6dadced81d13d273ff0b21cb7f4e"
            },
            {
              "fixed": "6ebef4a220a1ebe345de899ebb9ae394206fe921"
            },
            {
              "fixed": "89afe5e2dbea6e9d8e5f11324149d06fa3a4efca"
            },
            {
              "fixed": "9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772"
            },
            {
              "fixed": "6260fc85ed1298a71d24a75d01f8b2e56d489a60"
            },
            {
              "fixed": "282343cf8a4a5a3603b1cb0e17a7083e4a593b03"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.15.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.167"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.130"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.78"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.20"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31409.json"
  },
  "details": "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.",
  "id": "CVE-2026-31409",
  "modified": "2026-07-15T01:49:16.795543689Z",
  "published": "2026-04-06T07:38:21.223Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/282343cf8a4a5a3603b1cb0e17a7083e4a593b03"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6260fc85ed1298a71d24a75d01f8b2e56d489a60"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ebef4a220a1ebe345de899ebb9ae394206fe921"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e8b270813079c785696bce8802a3f920665c88c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/89afe5e2dbea6e9d8e5f11324149d06fa3a4efca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d073870dab8f6dadced81d13d273ff0b21cb7f4e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31409.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31409"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ksmbd: unset conn-\u003ebinding on failed binding request"
}