{"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":"2026-08-05T12:34:30.435Z"},"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"}}}}