{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "cca0526ef2344cab6944d7f441fc24e152da031b"
            },
            {
              "fixed": "a9940dcbe5cb92482c04efc7341039ddf7dbf607"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "37b5c06956183b65e6808b509cf637632016cdf7"
            },
            {
              "fixed": "22b7c1c619d808aec4cad3dc42103345e370d107"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "21538121efe6c8c5b51c742fa02cbe820bc48714"
            },
            {
              "fixed": "f9a162c2bbcd0ac85bd07c5b37cf20286048b65c"
            },
            {
              "fixed": "27b7c3e916218b5eb2ee350211140e961bfc49be"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.18.11"
            },
            {
              "fixed": "6.18.24"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.19.1"
            },
            {
              "fixed": "6.19.14"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.18.24"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.14"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.20.0"
            },
            {
              "fixed": "7.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31609.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()\n\nsmbd_send_batch_flush() already calls smbd_free_send_io(),\nso we should not call it again after smbd_post_send()\nmoved it to the batch list.",
  "id": "CVE-2026-31609",
  "modified": "2026-07-15T01:49:14.778834003Z",
  "published": "2026-04-24T14:42:30.797Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22b7c1c619d808aec4cad3dc42103345e370d107"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/27b7c3e916218b5eb2ee350211140e961bfc49be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9940dcbe5cb92482c04efc7341039ddf7dbf607"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9a162c2bbcd0ac85bd07c5b37cf20286048b65c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31609.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31609"
    },
    {
      "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:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()"
}