{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8"
            },
            {
              "fixed": "9cf7eb8919344932f909b2fac76296f7656fda8d"
            },
            {
              "fixed": "9919021a3b7974ae66a5f9915e3a48c10cfd409b"
            },
            {
              "fixed": "969bc6370334a5b4720c5470783295d6484bbc95"
            },
            {
              "fixed": "a3238b09c58f323e40743ce174cd0ab81b5c09ed"
            },
            {
              "fixed": "a8d17d22db591099519a89f14dd24810daba74c3"
            },
            {
              "fixed": "c2397b93fbb6f44a788fff30f99be2c20cc5e50f"
            },
            {
              "fixed": "d1ebfce2c1d161186a82e77590bf7da2ea1bce91"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.92"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.34"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64137.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: require net admin for CIFS SWN netlink\n\nCIFS_GENL_CMD_SWN_NOTIFY is the userspace witness-notify command.  The\nintended sender is the cifs.witness helper, but the generic-netlink\noperation currently has no capability flag, so any local process can send\nRESOURCE_CHANGE or CLIENT_MOVE notifications to the in-kernel witness\nhandler.\n\nThe same family exposes CIFS_GENL_MCGRP_SWN without multicast-group\ncapability flags.  Register messages sent to that group include the witness\nregistration id and, for NTLM-authenticated mounts, the username, domain,\nand password attributes copied from the CIFS session.  An unprivileged\nlocal process should not be able to join that group and receive those\nmessages.\n\nRequire CAP_NET_ADMIN for incoming SWN_NOTIFY commands with\nGENL_ADMIN_PERM, and require CAP_NET_ADMIN over the network namespace for\njoining the SWN multicast group with GENL_MCAST_CAP_NET_ADMIN.  The\ncifs.witness service runs with the privileges needed for both operations.",
  "id": "CVE-2026-64137",
  "modified": "2026-08-15T11:31:17.585564562Z",
  "published": "2026-07-19T15:40:31.045Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/969bc6370334a5b4720c5470783295d6484bbc95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9919021a3b7974ae66a5f9915e3a48c10cfd409b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9cf7eb8919344932f909b2fac76296f7656fda8d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3238b09c58f323e40743ce174cd0ab81b5c09ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8d17d22db591099519a89f14dd24810daba74c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2397b93fbb6f44a788fff30f99be2c20cc5e50f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1ebfce2c1d161186a82e77590bf7da2ea1bce91"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64137.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64137"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "smb: client: require net admin for CIFS SWN netlink"
}