{"api_version":"1","generated_at":"2026-10-31T00:39:40+00:00","cve":"CVE-2026-99128","urls":{"html":"https://cve.report/CVE-2026-99128","api":"https://cve.report/api/cve/CVE-2026-99128.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99128","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99128"},"summary":{"title":"sctp: validate chunk length in the inqueue parser","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate chunk length in the inqueue parser\n\nSCTP chunks always include a four-byte generic header, but\nsctp_inq_pop() currently accepts shorter declared lengths. A zero-length\nchunk leaves chunk_end at the current header.\n\nWhen ASCONF is covered by the association's SCTP-AUTH policy,\nsctp_assoc_bh_rcv() can continue before the state machine performs its\nnormal chunk-length check. sctp_inq_pop() then returns the same malformed\nchunk repeatedly and the receive softirq can lock up.\n\nA remote SCTP peer can trigger this after establishing an association on\na kernel built with CONFIG_IP_SCTP and configured with\nnet.sctp.addip_enable=1 and net.sctp.auth_enable=1. The reproducer did\nnot require application credentials, a shared SCTP AUTH key, or\nnet.sctp.addip_noauth_enable=1.\n\nOn commit f967455fb2a5 (\"seg6: reset IP6CB after IPv6 decapsulation\"),\none zero-length ASCONF caused repeated\nwatchdog soft-lockup reports in a two-vCPU KVM guest. All 3 pre-trigger\nhealth probes succeeded, while 36 of 37 post-trigger probes failed. With\nthis change, all 37 post-trigger probes succeeded and no equivalent\nsoft-lockup signature appeared.\n\nReject chunks shorter than the generic SCTP header at the shared inqueue\nparser boundary. Mark the packet for discard before either caller can\ncontinue processing it, while preserving the four-byte generic minimum.\nDeclared-length 1 through 4 controls and kernel-generated ASCONF traffic\nremained healthy. The patched sctp_hello selftest passed for IPv4 and\nIPv6.\n\nThe complete private reproducer and validation evidence are available\ndirectly to maintainers on request.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-28 11:17:32","updated_at":"2026-10-30 13:21:47"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/40507f59f230dcf60ae13cb48d34f8c6e9f40659","name":"https://git.kernel.org/stable/c/40507f59f230dcf60ae13cb48d34f8c6e9f40659","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b0dbd53b242609c88e81b0a49093bdbef5d5a418","name":"https://git.kernel.org/stable/c/b0dbd53b242609c88e81b0a49093bdbef5d5a418","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cc4a4f1d6b6d725438dc37b97f03d95ed9feb63f","name":"https://git.kernel.org/stable/c/cc4a4f1d6b6d725438dc37b97f03d95ed9feb63f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9ac57e4c62e93c287b36080e5da3645690549990","name":"https://git.kernel.org/stable/c/9ac57e4c62e93c287b36080e5da3645690549990","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d28ea1a62e27210d8ea3cf496dfae85dbdd7b84f","name":"https://git.kernel.org/stable/c/d28ea1a62e27210d8ea3cf496dfae85dbdd7b84f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a","name":"https://git.kernel.org/stable/c/6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e0fb7fe180488a5afa2e91509ea838e8df8cb771","name":"https://git.kernel.org/stable/c/e0fb7fe180488a5afa2e91509ea838e8df8cb771","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5a7ee52589dae36c93dc64d7a97c5ded84618572","name":"https://git.kernel.org/stable/c/5a7ee52589dae36c93dc64d7a97c5ded84618572","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99128","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99128","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bbd0d59809f923ea2b540cbd781b32110e249f6e cc4a4f1d6b6d725438dc37b97f03d95ed9feb63f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bbd0d59809f923ea2b540cbd781b32110e249f6e b0dbd53b242609c88e81b0a49093bdbef5d5a418 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bbd0d59809f923ea2b540cbd781b32110e249f6e d28ea1a62e27210d8ea3cf496dfae85dbdd7b84f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bbd0d59809f923ea2b540cbd781b32110e249f6e 5a7ee52589dae36c93dc64d7a97c5ded84618572 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.224 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.191 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.161 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.115 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.59 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.13 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"99128","cve":"CVE-2026-99128","epss":"0.001740000","percentile":"0.068890000","score_date":"2026-10-30","updated_at":"2026-10-31 00:01:13"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sctp/inqueue.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"cc4a4f1d6b6d725438dc37b97f03d95ed9feb63f","status":"affected","version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","versionType":"git"},{"lessThan":"b0dbd53b242609c88e81b0a49093bdbef5d5a418","status":"affected","version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","versionType":"git"},{"lessThan":"d28ea1a62e27210d8ea3cf496dfae85dbdd7b84f","status":"affected","version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","versionType":"git"},{"lessThan":"5a7ee52589dae36c93dc64d7a97c5ded84618572","status":"affected","version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","versionType":"git"},{"lessThan":"e0fb7fe180488a5afa2e91509ea838e8df8cb771","status":"affected","version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","versionType":"git"},{"lessThan":"40507f59f230dcf60ae13cb48d34f8c6e9f40659","status":"affected","version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","versionType":"git"},{"lessThan":"9ac57e4c62e93c287b36080e5da3645690549990","status":"affected","version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","versionType":"git"},{"lessThan":"6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a","status":"affected","version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sctp/inqueue.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.24"},{"lessThan":"2.6.24","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.273","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.224","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.191","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.161","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.115","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.59","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.273","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.224","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.191","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.161","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.115","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.59","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.13","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"2.6.24","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate chunk length in the inqueue parser\n\nSCTP chunks always include a four-byte generic header, but\nsctp_inq_pop() currently accepts shorter declared lengths. A zero-length\nchunk leaves chunk_end at the current header.\n\nWhen ASCONF is covered by the association's SCTP-AUTH policy,\nsctp_assoc_bh_rcv() can continue before the state machine performs its\nnormal chunk-length check. sctp_inq_pop() then returns the same malformed\nchunk repeatedly and the receive softirq can lock up.\n\nA remote SCTP peer can trigger this after establishing an association on\na kernel built with CONFIG_IP_SCTP and configured with\nnet.sctp.addip_enable=1 and net.sctp.auth_enable=1. The reproducer did\nnot require application credentials, a shared SCTP AUTH key, or\nnet.sctp.addip_noauth_enable=1.\n\nOn commit f967455fb2a5 (\"seg6: reset IP6CB after IPv6 decapsulation\"),\none zero-length ASCONF caused repeated\nwatchdog soft-lockup reports in a two-vCPU KVM guest. All 3 pre-trigger\nhealth probes succeeded, while 36 of 37 post-trigger probes failed. With\nthis change, all 37 post-trigger probes succeeded and no equivalent\nsoft-lockup signature appeared.\n\nReject chunks shorter than the generic SCTP header at the shared inqueue\nparser boundary. Mark the packet for discard before either caller can\ncontinue processing it, while preserving the four-byte generic minimum.\nDeclared-length 1 through 4 controls and kernel-generated ASCONF traffic\nremained healthy. The patched sctp_hello selftest passed for IPv4 and\nIPv6.\n\nThe complete private reproducer and validation evidence are available\ndirectly to maintainers on request."}],"providerMetadata":{"dateUpdated":"2026-10-30T12:42:02.124Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/cc4a4f1d6b6d725438dc37b97f03d95ed9feb63f"},{"url":"https://git.kernel.org/stable/c/b0dbd53b242609c88e81b0a49093bdbef5d5a418"},{"url":"https://git.kernel.org/stable/c/d28ea1a62e27210d8ea3cf496dfae85dbdd7b84f"},{"url":"https://git.kernel.org/stable/c/5a7ee52589dae36c93dc64d7a97c5ded84618572"},{"url":"https://git.kernel.org/stable/c/e0fb7fe180488a5afa2e91509ea838e8df8cb771"},{"url":"https://git.kernel.org/stable/c/40507f59f230dcf60ae13cb48d34f8c6e9f40659"},{"url":"https://git.kernel.org/stable/c/9ac57e4c62e93c287b36080e5da3645690549990"},{"url":"https://git.kernel.org/stable/c/6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a"}],"title":"sctp: validate chunk length in the inqueue parser","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99128","datePublished":"2026-10-28T10:34:42.229Z","dateReserved":"2026-09-25T10:25:14.394Z","dateUpdated":"2026-10-30T12:42:02.124Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-28 11:17:32","lastModifiedDate":"2026-10-30 13:21:47","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"99128","Ordinal":"1","Title":"sctp: validate chunk length in the inqueue parser","CVE":"CVE-2026-99128","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99128","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate chunk length in the inqueue parser\n\nSCTP chunks always include a four-byte generic header, but\nsctp_inq_pop() currently accepts shorter declared lengths. A zero-length\nchunk leaves chunk_end at the current header.\n\nWhen ASCONF is covered by the association's SCTP-AUTH policy,\nsctp_assoc_bh_rcv() can continue before the state machine performs its\nnormal chunk-length check. sctp_inq_pop() then returns the same malformed\nchunk repeatedly and the receive softirq can lock up.\n\nA remote SCTP peer can trigger this after establishing an association on\na kernel built with CONFIG_IP_SCTP and configured with\nnet.sctp.addip_enable=1 and net.sctp.auth_enable=1. The reproducer did\nnot require application credentials, a shared SCTP AUTH key, or\nnet.sctp.addip_noauth_enable=1.\n\nOn commit f967455fb2a5 (\"seg6: reset IP6CB after IPv6 decapsulation\"),\none zero-length ASCONF caused repeated\nwatchdog soft-lockup reports in a two-vCPU KVM guest. All 3 pre-trigger\nhealth probes succeeded, while 36 of 37 post-trigger probes failed. With\nthis change, all 37 post-trigger probes succeeded and no equivalent\nsoft-lockup signature appeared.\n\nReject chunks shorter than the generic SCTP header at the shared inqueue\nparser boundary. Mark the packet for discard before either caller can\ncontinue processing it, while preserving the four-byte generic minimum.\nDeclared-length 1 through 4 controls and kernel-generated ASCONF traffic\nremained healthy. The patched sctp_hello selftest passed for IPv4 and\nIPv6.\n\nThe complete private reproducer and validation evidence are available\ndirectly to maintainers on request.","Type":"Description","Title":"sctp: validate chunk length in the inqueue parser"}]}}}