{
  "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-2023-53296",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53296",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2025-09-16T08:11:28.519Z",
    "updatedAt": "2026-05-11T19:42:12.034Z",
    "importedAt": "2026-10-24T01:57:03.413Z",
    "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": "sctp: check send stream number after wait_for_sndbuf",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: check send stream number after wait_for_sndbuf\n\nThis patch fixes a corner case where the asoc out stream count may change\nafter wait_for_sndbuf.\n\nWhen the main thread in the client starts a connection, if its out stream\ncount is set to N while the in stream count in the server is set to N - 2,\nanother thread in the client keeps sending the msgs with stream number\nN - 1, and waits for sndbuf before processing INIT_ACK.\n\nHowever, after processing INIT_ACK, the out stream count in the client is\nshrunk to N - 2, the same to the in stream count in the server. The crash\noccurs when the thread waiting for sndbuf is awake and sends the msg in a\nnon-existing stream(N - 1), the call trace is as below:\n\n  KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]\n  Call Trace:\n   <TASK>\n   sctp_cmd_send_msg net/sctp/sm_sideeffect.c:1114 [inline]\n   sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1777 [inline]\n   sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline]\n   sctp_do_sm+0x197d/0x5310 net/sctp/sm_sideeffect.c:1170\n   sctp_primitive_SEND+0x9f/0xc0 net/sctp/primitive.c:163\n   sctp_sendmsg_to_asoc+0x10eb/0x1a30 net/sctp/socket.c:1868\n   sctp_sendmsg+0x8d4/0x1d90 net/sctp/socket.c:2026\n   inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:825\n   sock_sendmsg_nosec net/socket.c:722 [inline]\n   sock_sendmsg+0xde/0x190 net/socket.c:745\n\nThe fix is to add an unlikely check for the send stream number after the\nthread wakes up from the wait_for_sndbuf.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "5bbbbe32a43199c2b9ea5ea66fab6241c64beb51",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9346a1a21142357972a6f466ba6275ddc54b04ac"
            },
            {
              "version": "5bbbbe32a43199c2b9ea5ea66fab6241c64beb51",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0443fff49d6352160c200064156c25898bd9f58c"
            },
            {
              "version": "5bbbbe32a43199c2b9ea5ea66fab6241c64beb51",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b4b6dfad41aaae9e36e44327b18d5cf4b20dd2ce"
            },
            {
              "version": "5bbbbe32a43199c2b9ea5ea66fab6241c64beb51",
              "status": "affected",
              "versionType": "git",
              "lessThan": "667eb99cf7c15fe5b0ecefe75cf658e20ef20c9f"
            },
            {
              "version": "5bbbbe32a43199c2b9ea5ea66fab6241c64beb51",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d2128636b303aa9cf065055402ee6697409a8837"
            },
            {
              "version": "5bbbbe32a43199c2b9ea5ea66fab6241c64beb51",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a615e7270318fa0b98bf1ff38daf6cf52d840312"
            },
            {
              "version": "5bbbbe32a43199c2b9ea5ea66fab6241c64beb51",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2584024b23552c00d95b50255e47bd18d306d31a"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.15",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.15"
            },
            {
              "version": "4.19.281",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.241",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.178",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.107",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.24",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.2.11",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.2.*"
            },
            {
              "version": "6.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}