{"id":"CVE-2026-89482","title":"kernel: nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone (CVE-2026-89482)","summary":"A flaw was found in the nvme-tcp module of the Linux kernel. This vulnerability arises from improper handling of C2HData for REQ_OP_WRITE_ZEROES commands, where the system fails to adequately validate the data length. A remote attacker cou…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-787","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-10-24","sourceUpdated":"2026-10-24T01:35:31+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89482.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89482.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89482"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532128"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89482"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89482"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89482.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-89482"},{"url":"https://git.kernel.org/stable/c/32ea8ce96b9bd797c59c351ce490ffd97adaa8c0"},{"url":"https://git.kernel.org/stable/c/dd8906bb8f8d5bf1c9f861e1382c82b87bfe7cab"},{"url":"https://git.kernel.org/stable/c/7ed0b61bbc145988be292c4d3ec580aebd8d2bcd"},{"url":"https://git.kernel.org/stable/c/b96e1ff75e5c0ad6e077ac002b1d30b0a2b49528"},{"url":"https://git.kernel.org/stable/c/b36161701cb366f416afdcf70771d432a7c74753"},{"url":"https://git.kernel.org/stable/c/6a01b58263108eaf9869bb6f82f07709240c6589"},{"url":"https://git.kernel.org/stable/c/641ad3a30ba560f0a9a610376c568d7b75d2a2aa"},{"url":"https://git.kernel.org/stable/c/3a4aa9e6ad3e35f8e24d5eaf38ee4d437075fb36"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00714,"epssPercentile":0.53472,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T19:22:37.965026Z"},"scores":{"vendor":7,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.453Z","slug":"CVE-2026-89482","body":"## Overview\n\nA flaw was found in the nvme-tcp module of the Linux kernel. This vulnerability arises from improper handling of C2HData for REQ_OP_WRITE_ZEROES commands, where the system fails to adequately validate the data length. A remote attacker could exploit this by sending specially crafted C2HData, leading to a wild-memory-access. This memory corruption can cause a kernel crash, resulting in a Denial of Service (DoS) for the affected system.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89482.json)\n\n**kernel: nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-10-24.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n\n## Remediation\n\nFix deferred\n\nWorkarounds / mitigations:\n\n- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":228579,"id":"CVE-2026-89482","ts":1792844798183,"field":"cvss","old":"9.8","new":"8.8"},{"seq":228578,"id":"CVE-2026-89482","ts":1792844798183,"field":"severity","old":"critical","new":"high"},{"seq":223307,"id":"CVE-2026-89482","ts":1792180051641,"field":"cvss","old":"7","new":"9.8"},{"seq":223306,"id":"CVE-2026-89482","ts":1792180051641,"field":"severity","old":"high","new":"critical"},{"seq":205538,"id":"CVE-2026-89482","ts":1789576724446,"field":"cvss","old":"9.8","new":"7"},{"seq":205537,"id":"CVE-2026-89482","ts":1789576724446,"field":"severity","old":"critical","new":"high"},{"seq":198026,"id":"CVE-2026-89482","ts":1789384321447,"field":"cvss","old":"5.9","new":"9.8"},{"seq":198025,"id":"CVE-2026-89482","ts":1789384321447,"field":"severity","old":"medium","new":"critical"},{"seq":183792,"id":"CVE-2026-89482","ts":1789356677409,"field":"cvss","old":"9.8","new":"5.9"},{"seq":183791,"id":"CVE-2026-89482","ts":1789356677409,"field":"severity","old":"critical","new":"medium"},{"seq":153264,"id":"CVE-2026-89482","ts":1789285349796,"field":"cvss","old":null,"new":"9.8"},{"seq":153263,"id":"CVE-2026-89482","ts":1789285349796,"field":"severity","old":"none","new":"critical"},{"seq":147784,"id":"CVE-2026-89482","ts":1789270212277,"field":"cvss","old":null,"new":"5.9"},{"seq":147783,"id":"CVE-2026-89482","ts":1789270212277,"field":"severity","old":"none","new":"medium"},{"seq":109534,"id":"CVE-2026-89482","ts":1789183732316,"field":"cvss","old":null,"new":"5.9"},{"seq":109533,"id":"CVE-2026-89482","ts":1789183732316,"field":"severity","old":"none","new":"medium"}]}