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CVE-2026-53224 (GCVE-0-2026-53224)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:34
VLAI
Title
sctp: validate embedded INIT chunk and address list lengths in cookie
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: validate embedded INIT chunk and address list lengths in cookie sctp_unpack_cookie() only checked that the embedded INIT chunk length did not exceed the remaining cookie payload, but did not ensure that the INIT chunk is large enough to contain a complete INIT header. A malformed COOKIE_ECHO can therefore carry a truncated INIT chunk whose length field is smaller than sizeof(struct sctp_init_chunk). Later, sctp_process_init() accesses INIT parameters unconditionally, which may lead to out-of-bounds reads. In addition, raw_addr_list_len is not fully validated against the remaining cookie payload. When cookie authentication is disabled, an attacker can supply an oversized raw_addr_list_len and cause sctp_raw_to_bind_addrs() to read beyond the end of the cookie. The address parser also lacks sufficient bounds checks for parameter headers and lengths, allowing malformed address parameters to trigger out-of-bounds reads. Fix this by: - requiring the embedded INIT chunk length to be at least sizeof(struct sctp_init_chunk); - validating that the INIT chunk and raw address list together fit within the cookie payload; - verifying sufficient data exists for each address parameter header and payload before parsing it. Note that sctp_verify_init() must be called after sctp_unpack_cookie() and before sctp_process_init() when cookie authentication is disabled. This will be addressed in a separate patch.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7560afb8cddafd829e709d7ea09230e45a825557 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 512a9bb77c04ac9927648ea58af617e472be96e6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6f4c80a2a7e6d06753b89a578b710a2499a5e62b (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "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."
        }
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
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              "value": "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."
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    "cveId": "CVE-2026-53224",
    "datePublished": "2026-06-25T08:39:25.254Z",
    "dateReserved": "2026-06-09T07:44:35.392Z",
    "dateUpdated": "2026-08-05T12:34:16.814Z",
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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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:35:46+00:00",
      "cve": "CVE-2026-53224",
      "id": "CVE-2026-53224",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: validate embedded INIT chunk and address list lengths in cookie",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53224.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-16T00:11:14Z",
      "cve": "CVE-2026-53224",
      "id": "CVE-2026-53224",
      "initial_release_date": "2026-06-26T02:09:34Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "519",
      "product_status:recommended": "703",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53224",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53224.json",
      "version": "27"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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