{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-98253",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-98253",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-06T08:45:20.077Z",
    "updatedAt": "2026-10-19T09:16:24.567Z",
    "importedAt": "2026-10-24T01:58:41.756Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "RDMA/ucma: Serialize join and leave on copy_to_user failure",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/ucma: Serialize join and leave on copy_to_user failure\n\nrdma_join_multicast() queues RoCE work that later reads the ucma_multicast\nthrough event->param.ud.private_data, then list_add()s the CMA multicast\nat the head of id_priv->mc_list. rdma_leave_multicast() matches only by\nsockaddr and destroys the first hit.\n\nucma_process_join() used to drop ctx->mutex after a successful join and\nretake it only if copy_to_user() failed. Two concurrent JOIN_MCAST calls\nwith the same address can therefore insert a second CMA entry before the\nfirst thread's leave. leave then cancels the newer work and the older\nworker still dereferences the ucma_multicast that the first thread frees.\n\nKeep ctx->mutex held from rdma_join_multicast() through copy_to_user() and,\non -EFAULT, through rdma_leave_multicast() so leave cannot miss this join.\nDo not leave if join itself failed: that path never published this address\non mc_list, and a leave-by-addr would destroy an earlier successful join.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "60d613b39e8d0c9f3b526e9c96445422b4562d76",
              "status": "affected",
              "versionType": "git",
              "lessThan": "29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9"
            },
            {
              "version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "52172e11bd074ccaded21740ffeb67123f01dd00"
            },
            {
              "version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "01e29d0d78a8f66f221625720a04939eef5ec1f6"
            },
            {
              "version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ae805d204cf1f15b87d1bf3529b4c649f3519420"
            },
            {
              "version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "43c4e24bd10370fc976f6220518049ce71419399"
            },
            {
              "version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "01cbdb724c584d7772fd25af2e4dfdf8527ce0d5"
            },
            {
              "version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "83610ee5e498fa5bfcb80031d2b959baea276bf6"
            },
            {
              "version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "662ade4de9ff5eceb0820a9f8e9fac70ba6a815b"
            },
            {
              "version": "a3262b3884dd67b4c5632ce7cdf9cff9d1a575d4",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "5.10.20",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.10.271"
            },
            {
              "version": "5.11.3",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.12"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.12",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.12"
            },
            {
              "version": "5.10.271",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.222",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.189",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.158",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.112",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.54",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.2.8",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}