{"id":"CVE-2026-89533","title":"kernel: svcrdma: Fix offset arithmetic in read_chunk_range (CVE-2026-89533)","summary":"A flaw was found in the `svcrdma` component of the Linux kernel. Incorrect offset arithmetic in the `svc_rdma_read_chunk_range()` function can lead to a `u32` underflow. This underflow can cause the system to attempt to allocate a large am…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-191","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":"2026-09-14","sourceUpdated":"2026-09-14T18:58:30+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89533.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89533.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89533"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532058"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89533"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89533"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89533.mbox"},{"url":"https://git.kernel.org/stable/c/10873311f91db9454e2fadbf9866bc819e0646d9"},{"url":"https://git.kernel.org/stable/c/addbf02dfe3b25e7e38e03bbd4e2a6ed86a14be7"},{"url":"https://git.kernel.org/stable/c/cba8543c18cf42fd80fd63effb6df6ff4f7e73ce"},{"url":"https://git.kernel.org/stable/c/6ee4dc7476b3abc92ec1d444533a559f33f59561"},{"url":"https://git.kernel.org/stable/c/a46b35f213c2426f5d6a0458a8f7e873fc59cdfd"},{"url":"https://git.kernel.org/stable/c/4493c96bbd0068fadf69cbae8d13426202e34cdc"},{"url":"https://git.kernel.org/stable/c/4a44c140cc2f3643a39e258bb0c0ab9d0f494f5e"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00509,"epssPercentile":0.42444,"scores":{"vendor":7,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.452Z","slug":"CVE-2026-89533","body":"## Overview\n\nA flaw was found in the `svcrdma` component of the Linux kernel. Incorrect offset arithmetic in the `svc_rdma_read_chunk_range()` function can lead to a `u32` underflow. This underflow can cause the system to attempt to allocate a large amount of memory, potentially resulting in a Denial of Service (DoS) due to excessive memory consumption.\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 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89533.json)\n\n**kernel: svcrdma: Fix offset arithmetic in read_chunk_range** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.\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\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":204181,"id":"CVE-2026-89533","ts":1789490237185,"field":"cvss","old":"9.8","new":"7"},{"seq":204180,"id":"CVE-2026-89533","ts":1789490237185,"field":"severity","old":"critical","new":"high"},{"seq":197979,"id":"CVE-2026-89533","ts":1789384321233,"field":"cvss","old":"5.9","new":"9.8"},{"seq":197978,"id":"CVE-2026-89533","ts":1789384321233,"field":"severity","old":"medium","new":"critical"},{"seq":183764,"id":"CVE-2026-89533","ts":1789356677288,"field":"cvss","old":"9.8","new":"5.9"},{"seq":183763,"id":"CVE-2026-89533","ts":1789356677288,"field":"severity","old":"critical","new":"medium"},{"seq":153326,"id":"CVE-2026-89533","ts":1789285350057,"field":"cvss","old":null,"new":"9.8"},{"seq":153325,"id":"CVE-2026-89533","ts":1789285350057,"field":"severity","old":"none","new":"critical"},{"seq":109596,"id":"CVE-2026-89533","ts":1789183732557,"field":"cvss","old":null,"new":"5.9"},{"seq":109595,"id":"CVE-2026-89533","ts":1789183732557,"field":"severity","old":"none","new":"medium"}]}