{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53224",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53224"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "sctp: validate embedded INIT chunk and address list lengths in cookie",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate embedded INIT chunk and address list lengths in cookie\n\nsctp_unpack_cookie() only checked that the embedded INIT chunk length\ndid not exceed the remaining cookie payload, but did not ensure that the\nINIT chunk is large enough to contain a complete INIT header.\n\nA malformed COOKIE_ECHO can therefore carry a truncated INIT chunk whose\nlength field is smaller than sizeof(struct sctp_init_chunk).  Later,\nsctp_process_init() accesses INIT parameters unconditionally, which may\nlead to out-of-bounds reads.\n\nIn addition, raw_addr_list_len is not fully validated against the\nremaining cookie payload. When cookie authentication is disabled, an\nattacker can supply an oversized raw_addr_list_len and cause\nsctp_raw_to_bind_addrs() to read beyond the end of the cookie. The\naddress parser also lacks sufficient bounds checks for parameter headers\nand lengths, allowing malformed address parameters to trigger\nout-of-bounds reads.\n\nFix this by:\n\n- requiring the embedded INIT chunk length to be at least sizeof(struct\n  sctp_init_chunk);\n- validating that the INIT chunk and raw address list together fit\n  within the cookie payload;\n- verifying sufficient data exists for each address parameter header and\n  payload before parsing it.\n\nNote that sctp_verify_init() must be called after sctp_unpack_cookie()\nand before sctp_process_init() when cookie authentication is disabled.\nThis will be addressed in a separate patch.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": null
          },
          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.36"
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            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.36"
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            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.36"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53224"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7560afb8cddafd829e709d7ea09230e45a825557"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/512a9bb77c04ac9927648ea58af617e472be96e6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6f4c80a2a7e6d06753b89a578b710a2499a5e62b"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.1,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - An unauthenticated remote SCTP peer can reach the vulnerable COOKIE_ECHO processing path by sending SCTP packets to a listening SCTP endpoint. In deployments with cookie HMAC disabled, the attacker can obtain and modify the state cookie over the network.\nAC:L - The bug is triggered with a malformed COOKIE_ECHO and attacker-controlled embedded INIT/address-list lengths; no race or hard-to-control timing condition is required. The no-cookie-auth deployment condition is a reasonable supported SCTP configuration.\nPR:N - No credentials or local privileges are needed to send SCTP INIT/COOKIE_ECHO traffic to a listening service. The vulnerable parsing occurs before any application authentication.\nUI:N - Exploitation only requires sending network packets to the target SCTP endpoint. No victim user action is required.\nS:U - The impact is within the kernel/network stack security authority of the target system. It does not cross a separate boundary such as guest-to-host or IOMMU isolation.\nC:H - The malformed lengths can drive out-of-bounds kernel reads beyond the COOKIE_ECHO payload, including attacker-controlled oversized address-list parsing. Because the read is not strictly bounded to a few bytes and related SCTP COOKIE_ECHO bugs demonstrate kernel memory leakage potential, confidentiality impact is High.\nI:N - The investigated fix addresses out-of-bounds reads and missing length validation, not an out-of-bounds write or direct arbitrary memory modification primitive. I did not find a defensible direct integrity impact from this bug alone.\nA:H - The attacker-controlled out-of-bounds reads can walk beyond the skb/cookie buffer and fault or trigger KASAN/oops conditions. A remotely triggerable kernel crash is High availability impact."
    }
  }
}