{"id":"CVE-2026-89728","title":"kernel: i3c: renesas: Fix out-of-bounds access for newdevs mask (CVE-2026-89728)","summary":"A flaw was found in the Linux kernel's I3C Renesas driver. When the I3C bus is empty and software initiates Dynamic Address Assignment (DAA), an out-of-bounds access can occur. This is due to an incorrect calculation of the newly discovere…","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-805","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T14:06:02+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89728.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89728.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89728"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532480"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89728"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89728"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89728.mbox"},{"url":"https://git.kernel.org/stable/c/769f5a233efcf8587f70fb2244a202d88582c746"},{"url":"https://git.kernel.org/stable/c/50dec95c9d1f1f82819bc898ef2b60fa83fd4ccd"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00156,"epssPercentile":0.05134,"ingestedAt":"2026-09-14T11:11:19.885Z","slug":"CVE-2026-89728","body":"## Overview\n\nA flaw was found in the Linux kernel's I3C Renesas driver. When the I3C bus is empty and software initiates Dynamic Address Assignment (DAA), an out-of-bounds access can occur. This is due to an incorrect calculation of the newly discovered devices bitmask, which can lead to system instability or other undefined behavior.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89728.json)\n\n**kernel: i3c: renesas: Fix out-of-bounds access for newdevs mask** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nAffected:\n\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":203856,"id":"CVE-2026-89728","ts":1789490210188,"field":"cvss","old":null,"new":"5.5"},{"seq":203855,"id":"CVE-2026-89728","ts":1789490210188,"field":"severity","old":"none","new":"medium"},{"seq":147137,"id":"CVE-2026-89728","ts":1789270196235,"field":"cvss","old":null,"new":"4.7"},{"seq":147136,"id":"CVE-2026-89728","ts":1789270196235,"field":"severity","old":"none","new":"medium"},{"seq":108892,"id":"CVE-2026-89728","ts":1789183729431,"field":"cvss","old":null,"new":"4.7"},{"seq":108891,"id":"CVE-2026-89728","ts":1789183729431,"field":"severity","old":"none","new":"medium"}]}