{ "document": { "aggregate_severity": { "text": "Critical" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/amazonlinux2els/vex/2026/cve-2026-99128-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:41:32Z", "generator": { "date": "2026-11-07T21:41:32Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-99128-ELS_OS-AMAZONLINUX2ELS", "initial_release_date": "2026-10-28T11:17:00Z", "revision_history": [ { "date": "2026-10-28T11:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-11-07T21:41:32Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-99128", "notes": [ { "category": "description", "text": "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.", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64" ], "known_affected": [ "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", 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URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-99128" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/40507f59f230dcf60ae13cb48d34f8c6e9f40659", "url": "https://git.kernel.org/stable/c/40507f59f230dcf60ae13cb48d34f8c6e9f40659" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5a7ee52589dae36c93dc64d7a97c5ded84618572", "url": "https://git.kernel.org/stable/c/5a7ee52589dae36c93dc64d7a97c5ded84618572" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a", "url": "https://git.kernel.org/stable/c/6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/9ac57e4c62e93c287b36080e5da3645690549990", "url": "https://git.kernel.org/stable/c/9ac57e4c62e93c287b36080e5da3645690549990" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/b0dbd53b242609c88e81b0a49093bdbef5d5a418", "url": "https://git.kernel.org/stable/c/b0dbd53b242609c88e81b0a49093bdbef5d5a418" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/cc4a4f1d6b6d725438dc37b97f03d95ed9feb63f", "url": "https://git.kernel.org/stable/c/cc4a4f1d6b6d725438dc37b97f03d95ed9feb63f" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/d28ea1a62e27210d8ea3cf496dfae85dbdd7b84f", "url": "https://git.kernel.org/stable/c/d28ea1a62e27210d8ea3cf496dfae85dbdd7b84f" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/e0fb7fe180488a5afa2e91509ea838e8df8cb771", "url": "https://git.kernel.org/stable/c/e0fb7fe180488a5afa2e91509ea838e8df8cb771" } ], "release_date": "2026-10-28T11:17:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-11-05T12:53:42.499096Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1793883221", "product_ids": [ "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1793883221" }, { "category": "none_available", "date": "2026-10-28T11:17:00Z", "details": "Affected", "product_ids": [ "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:bpftool-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", 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