{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99128","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.394Z","datePublished":"2026-10-28T10:34:42.229Z","dateUpdated":"2026-10-30T12:42:02.124Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-30T12:42:02.124Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/inqueue.c"],"versions":[{"version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","lessThan":"cc4a4f1d6b6d725438dc37b97f03d95ed9feb63f","status":"affected","versionType":"git"},{"version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","lessThan":"b0dbd53b242609c88e81b0a49093bdbef5d5a418","status":"affected","versionType":"git"},{"version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","lessThan":"d28ea1a62e27210d8ea3cf496dfae85dbdd7b84f","status":"affected","versionType":"git"},{"version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","lessThan":"5a7ee52589dae36c93dc64d7a97c5ded84618572","status":"affected","versionType":"git"},{"version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","lessThan":"e0fb7fe180488a5afa2e91509ea838e8df8cb771","status":"affected","versionType":"git"},{"version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","lessThan":"40507f59f230dcf60ae13cb48d34f8c6e9f40659","status":"affected","versionType":"git"},{"version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","lessThan":"9ac57e4c62e93c287b36080e5da3645690549990","status":"affected","versionType":"git"},{"version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","lessThan":"6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a","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/inqueue.c"],"versions":[{"version":"2.6.24","status":"affected"},{"version":"0","lessThan":"2.6.24","status":"unaffected","versionType":"semver"},{"version":"5.10.273","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.224","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.191","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.161","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.115","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.59","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.13","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","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":"2.6.24","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.6.161"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.12.115"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.18.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"7.2.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"7.3"}]}]}],"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"}}}}