{"id":"CVE-2026-89509","title":"kernel: RDMA/ionic: Embed counter driver data in rdma_counter allocation (CVE-2026-89509)","summary":"A flaw was found in the Linux kernel's RDMA/ionic driver. This vulnerability arises from the driver's incorrect handling of `rdma_counter` allocations, specifically by not embedding counter driver data as required. This oversight can lead …","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-476","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T12:43:33+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89509.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89509.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89509"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532215"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89509"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89509"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89509.mbox"},{"url":"https://git.kernel.org/stable/c/08b8630b557828aedb1d9ef0a6e2ec421f334ee2"},{"url":"https://git.kernel.org/stable/c/c98197ee3cd28288da13dc9881bb9e74daa7cbbc"},{"url":"https://git.kernel.org/stable/c/cf3ebd89e754015625fee90aa938f6bc79a2c974"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00198,"epssPercentile":0.09825,"ingestedAt":"2026-09-14T11:11:19.887Z","slug":"CVE-2026-89509","body":"## Overview\n\nA flaw was found in the Linux kernel's RDMA/ionic driver. This vulnerability arises from the driver's incorrect handling of `rdma_counter` allocations, specifically by not embedding counter driver data as required. This oversight can lead to a NULL pointer dereference when the `alloc_and_bind()` function is called. A local attacker could potentially trigger this flaw, causing the system to crash and resulting in a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89509.json)\n\n**kernel: RDMA/ionic: Embed counter driver data in rdma_counter allocation** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\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\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":206939,"id":"CVE-2026-89509","ts":1789749709440,"field":"cvss","old":"4.1","new":"5.5"},{"seq":204073,"id":"CVE-2026-89509","ts":1789490231314,"field":"cvss","old":null,"new":"4.1"},{"seq":204072,"id":"CVE-2026-89509","ts":1789490231314,"field":"severity","old":"none","new":"medium"},{"seq":147590,"id":"CVE-2026-89509","ts":1789270211508,"field":"cvss","old":null,"new":"4.1"},{"seq":147589,"id":"CVE-2026-89509","ts":1789270211508,"field":"severity","old":"none","new":"medium"},{"seq":109350,"id":"CVE-2026-89509","ts":1789183731567,"field":"cvss","old":null,"new":"4.1"},{"seq":109349,"id":"CVE-2026-89509","ts":1789183731567,"field":"severity","old":"none","new":"medium"}]}