{
  "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-2021-47124",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47124",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-03-15T20:14:29.605Z",
    "updatedAt": "2026-08-05T08:46:08.931Z",
    "importedAt": "2026-10-24T01:56:36.661Z",
    "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": "io_uring: fix link timeout refs",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix link timeout refs\n\nWARNING: CPU: 0 PID: 10242 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28\nRIP: 0010:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28\nCall Trace:\n __refcount_sub_and_test include/linux/refcount.h:283 [inline]\n __refcount_dec_and_test include/linux/refcount.h:315 [inline]\n refcount_dec_and_test include/linux/refcount.h:333 [inline]\n io_put_req fs/io_uring.c:2140 [inline]\n io_queue_linked_timeout fs/io_uring.c:6300 [inline]\n __io_queue_sqe+0xbef/0xec0 fs/io_uring.c:6354\n io_submit_sqe fs/io_uring.c:6534 [inline]\n io_submit_sqes+0x2bbd/0x7c50 fs/io_uring.c:6660\n __do_sys_io_uring_enter fs/io_uring.c:9240 [inline]\n __se_sys_io_uring_enter+0x256/0x1d60 fs/io_uring.c:9182\n\nio_link_timeout_fn() should put only one reference of the linked timeout\nrequest, however in case of racing with the master request's completion\nfirst io_req_complete() puts one and then io_put_req_deferred() is\ncalled.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "1c20e9040f49687ba2ccc2ffd4411351a6c2ebff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0b2a990e5d2f76d020cb840c456e6ec5f0c27530"
            },
            {
              "version": "1c20e9040f49687ba2ccc2ffd4411351a6c2ebff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6f5d7a45f58d3abe3a936de1441b8d6318f978ff"
            },
            {
              "version": "9ae1f8dd372e0e4c020b345cf9e09f519265e981",
              "status": "affected",
              "versionType": "git",
              "lessThan": "876808dba2ff7509bdd7f230c4f374a0caf4f410"
            },
            {
              "version": "9ae1f8dd372e0e4c020b345cf9e09f519265e981",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ff4a96ba5c8f9b266706280ff8021d2ef3f17e86"
            },
            {
              "version": "9ae1f8dd372e0e4c020b345cf9e09f519265e981",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a298232ee6b9a1d5d732aa497ff8be0d45b5bd82"
            },
            {
              "version": "567c81912cec641db75ac6cb64c63f8367c97d19",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "5.10.26",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.10.43"
            },
            {
              "version": "5.10.26",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.10.55"
            },
            {
              "version": "5.11.6",
              "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": "5.10.43",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.10.55",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.12.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.12.*"
            },
            {
              "version": "5.12.19",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.12.*"
            },
            {
              "version": "5.13",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}