{"id":"CVE-2026-89505","title":"kernel: RDMA/uverbs: Guard legacy bundles without method_elm (CVE-2026-89505)","summary":"A flaw was found in the Linux kernel's RDMA/uverbs component. Malformed input from a provider in the legacy write path can cause the `uverbs_get_handler_fn()` function to dereference an uninitialized pointer. This can lead to a system cras…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-824","vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","affected":["enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T21:34:30+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89505.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89505.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89505"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532252"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89505"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89505"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89505.mbox"},{"url":"https://git.kernel.org/stable/c/60a42d510113f46de47e86a84bf5758597644487"},{"url":"https://git.kernel.org/stable/c/edae84e5461749ed9adf9fcf5c6e075381040ac3"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00162,"epssPercentile":0.05865,"ingestedAt":"2026-09-14T11:11:19.887Z","slug":"CVE-2026-89505","body":"## Overview\n\nA flaw was found in the Linux kernel's RDMA/uverbs component. Malformed input from a provider in the legacy write path can cause the `uverbs_get_handler_fn()` function to dereference an uninitialized pointer. This can lead to a system crash, resulting in a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89505.json)\n\n**kernel: RDMA/uverbs: Guard legacy bundles without method_elm** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nAffected:\n\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n\nNot affected:\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\nOut of support scope","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":206942,"id":"CVE-2026-89505","ts":1789749710360,"field":"cvss","old":"4.7","new":"5.5"},{"seq":204053,"id":"CVE-2026-89505","ts":1789490231213,"field":"cvss","old":null,"new":"4.7"},{"seq":204052,"id":"CVE-2026-89505","ts":1789490231213,"field":"severity","old":"none","new":"medium"},{"seq":147582,"id":"CVE-2026-89505","ts":1789270211475,"field":"cvss","old":null,"new":"4.7"},{"seq":147581,"id":"CVE-2026-89505","ts":1789270211475,"field":"severity","old":"none","new":"medium"},{"seq":109334,"id":"CVE-2026-89505","ts":1789183731468,"field":"cvss","old":null,"new":"4.7"},{"seq":109333,"id":"CVE-2026-89505","ts":1789183731468,"field":"severity","old":"none","new":"medium"}]}