{"id":"CVE-2026-98548","title":"kernel: sctp: discard the rest of the packet on a stale-cookie error (CVE-2026-98548)","summary":"A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation. A remote attacker or an unprivileged local user could trigger a Denial of Service (DoS) or memory corruption by sending specially crafted pa…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-825","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4","enterprise_linux 6"],"published":"2026-10-18","updated":"2026-10-24","sourceUpdated":"2026-10-24T14:22:56+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98548.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98548.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98548"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554972"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98548"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98548"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98548.mbox"},{"url":"https://git.kernel.org/stable/c/c0af3fd150fdc43821df3bb77e5ec74faf4dfc7a"},{"url":"https://git.kernel.org/stable/c/854c053c71459f8db7ef07db9cfa4eec5f5206f2"},{"url":"https://git.kernel.org/stable/c/965e21ea16acb394d5e5801998ca9b0adc669665"},{"url":"https://git.kernel.org/stable/c/1cd246b214dc9acf4e2f11d58c035e1e672fe7d2"},{"url":"https://git.kernel.org/stable/c/d68c9287b3ca0d6faadc61fbcb18d1a6b5493321"},{"url":"https://git.kernel.org/stable/c/ec23855274a73906b02f0d124fefd9cb3c008b1d"},{"url":"https://git.kernel.org/stable/c/6df536c5acbc0abd6f119d02e24f4a2ed97707f4"},{"url":"https://git.kernel.org/stable/c/4498467a8af06cfa3d71cb04bd7c4170dec8f449"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00694,"epssPercentile":0.5274,"scores":{"vendor":7.5,"cna":9.8},"ingestedAt":"2026-10-18T15:45:12.265Z","slug":"CVE-2026-98548","body":"## Overview\n\nA flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation. A remote attacker or an unprivileged local user could trigger a Denial of Service (DoS) or memory corruption by sending specially crafted packets containing bundled error and data chunks. This issue causes a use-after-free condition when a network transport structure is removed while remaining chunks in the same packet continue to reference it.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98548.json)\n\n**kernel: sctp: discard the rest of the packet on a stale-cookie error** — rated Important by Red Hat. Released 2026-10-18, updated 2026-10-24.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nAffected\n\nWorkarounds / mitigations:\n\n- --- CME Mitigation Guidance (2026-10-20) ---\nDisclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.\n\nThe highest-value action is to discard remaining bundled chunks in incoming SCTP packets immediately upon handlin…","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":229555,"id":"CVE-2026-98548","ts":1793019843853,"field":"cvss","old":"9.8","new":"7.5"},{"seq":229554,"id":"CVE-2026-98548","ts":1793019843853,"field":"severity","old":"critical","new":"high"},{"seq":228932,"id":"CVE-2026-98548","ts":1792854114044,"field":"cvss","old":"7.5","new":"9.8"},{"seq":228931,"id":"CVE-2026-98548","ts":1792854114044,"field":"severity","old":"high","new":"critical"},{"seq":225832,"id":"CVE-2026-98548","ts":1792498469425,"field":"cvss","old":null,"new":"7.5"},{"seq":225831,"id":"CVE-2026-98548","ts":1792498469425,"field":"severity","old":"none","new":"high"}]}