{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53246", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.394Z", "datePublished": "2026-06-25T08:39:39.896Z", "dateUpdated": "2026-10-19T19:57:31.408Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:34:30.435Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate cached peer INIT chunk length in COOKIE_ECHO processing\n\nWhen a listening SCTP server processes a COOKIE_ECHO chunk, the cached\npeer INIT chunk embedded after the cookie is parsed and its parameters\nare later walked by sctp_process_init() using sctp_walk_params().\n\nHowever, the chunk header length of this cached INIT chunk was not\nvalidated against the remaining buffer in the COOKIE_ECHO payload. If\nthe length field is inflated, the parameter walk can run beyond the\nactual received data, leading to out-of-bounds reads and potential\nmemory corruption during later parameter handling (e.g. STATE_COOKIE\nprocessing and kmemdup() copies).\n\nAdd a bounds check in sctp_unpack_cookie() to ensure the cached INIT\nchunk length does not exceed the available data in the COOKIE_ECHO\nbuffer before it is used." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable COOKIE_ECHO processing is reached by remote SCTP packets delivered through the IPv4/IPv6 SCTP protocol handlers to a listening SCTP endpoint.\nAC:L - In a deployment with SCTP cookie HMAC disabled, the attacker can obtain a cookie through the normal INIT/INIT_ACK exchange, modify the cached INIT length, and send the forged COOKIE_ECHO without races or conditions outside attacker control.\nPR:N - The path is pre-authentication network protocol handling for a listening SCTP server; no local account or SCTP authentication is required when cookie HMAC is disabled.\nUI:N - Exploitation only requires sending SCTP handshake packets to the target listener and does not require victim user action.\nS:U - The impact is within the Linux kernel/network stack security authority and does not cross a separate boundary such as guest-to-host or IOMMU isolation.\nC:H - The inflated cached INIT length drives out-of-bounds parameter walking and attacker-sized kmemdup() reads beyond the received skb, which can expose kernel memory.\nI:H - The bug is kernel memory-safety corruption during nested parameter handling, and the higher-severity choice is appropriate because attacker-controlled parsing and copies beyond the valid buffer can corrupt kernel association state and plausibly support stronger primitives.\nA:H - The out-of-bounds reads and large attacker-controlled copies can trigger kernel faults, KASAN splats, allocation failure paths, or repeated remote crashes of SCTP processing." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sctp/sm_make_chunk.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "cc272185c9a9a4b7febc2de52eeaa3d00f19091e", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "edccbf3d63b0a3362bc916ea72edacc1e1ca456a", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "0861615c28de668669d748ef4eb913ea9262d13b", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sctp/sm_make_chunk.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cc272185c9a9a4b7febc2de52eeaa3d00f19091e" }, { "url": "https://git.kernel.org/stable/c/edccbf3d63b0a3362bc916ea72edacc1e1ca456a" }, { "url": "https://git.kernel.org/stable/c/0861615c28de668669d748ef4eb913ea9262d13b" } ], "title": "sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-53246", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:27:37.139455Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:57:31.408Z" } } ] } }