{"schema":"threatline.record/2","record":{"id":"CVE-2026-99128","aliases":[],"summary":"sctp: validate chunk length in the inqueue parser","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99128","source_modified_at":"2026-10-28T10:34:42.229Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","lessThan":"40507f59f230dcf60ae13cb48d34f8c6e9f40659","status":"affected","versionType":"git"},{"version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","lessThan":"9ac57e4c62e93c287b36080e5da3645690549990","status":"affected","versionType":"git"},{"version":"bbd0d59809f923ea2b540cbd781b32110e249f6e","lessThan":"6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99128","source_modified_at":"2026-10-28T10:34:42.229Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"2.6.24","status":"affected"},{"version":"0","lessThan":"2.6.24","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"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99128","source_modified_at":"2026-10-28T10:34:42.229Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"40507f59f230dcf60ae13cb48d34f8c6e9f40659","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99128","source_modified_at":"2026-10-28T10:34:42.229Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"9ac57e4c62e93c287b36080e5da3645690549990","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99128","source_modified_at":"2026-10-28T10:34:42.229Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-28T10:34:42.229Z","modified_at":"2026-10-28T10:34:42.229Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-99128","fetched_at":"2026-10-28T15:55:58.673066Z","source_modified_at":"2026-10-28T10:34:42.229Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/40507f59f230dcf60ae13cb48d34f8c6e9f40659"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/9ac57e4c62e93c287b36080e5da3645690549990"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-28T10:34:42.229Z","content_hash":"59e6148e7a3184b13282679fd2577d904a1acece14a418ef9f4183dbb36b48cc"}}