{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "489d8e559c6596eb08e16447d9830bc39afbe54e"
            },
            {
              "fixed": "ae9e534e502a0f48c12baf83608c5de0ff0eab11"
            },
            {
              "fixed": "6369619f1b665f12d8c99cc6ff733c64eb08b22e"
            },
            {
              "fixed": "712714f818d83373847874ab0f8e426be79296cf"
            },
            {
              "fixed": "4d45250b1d22960f86d83245be188b16e456218b"
            },
            {
              "fixed": "d2248cb70c070f8f04762872772e155b59016f17"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.14.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74401.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndlm: fix add msg handle in send_queue ordered\n\nIn a benchmark scenario triggering a lot of requests that triggers a lot\nof DLM messages on the network it can be that the mh-\u003eseq is not ordered\naccording the oldest seq number. This ordering is required by\ndlm_receive_ack as \"before(mh-\u003eseq, seq)\" will stop to check for older\nsequence numbers that are ordered in the tail of \"node-\u003esend_queue\".\n\nThe side effects of not having it correct ordered regarding\n\"before(mh-\u003eseq, seq)\" are refcounting issues and use-after free.\n\nI only was able to reproduce this issue in a experimental DLM branch\nand a user space DLM benchmark that uses io_uring. After changing this I\ndon't experienced any refcounting with the sending buffer issues anymore.",
  "id": "CVE-2026-74401",
  "modified": "2026-08-18T03:30:53.020494911Z",
  "published": "2026-08-15T05:59:12.099Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d45250b1d22960f86d83245be188b16e456218b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6369619f1b665f12d8c99cc6ff733c64eb08b22e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/712714f818d83373847874ab0f8e426be79296cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae9e534e502a0f48c12baf83608c5de0ff0eab11"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2248cb70c070f8f04762872772e155b59016f17"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74401.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74401"
    },
    {
      "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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "dlm: fix add msg handle in send_queue ordered"
}