{"id":"CVE-2026-89513","title":"kernel: RISC-V: KVM: Fix PMU event info array size overflow (CVE-2026-89513)","summary":"A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) component for RISC-V architectures. A malicious guest operating system could exploit an integer overflow vulnerability by providing a crafted number of Performance M…","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-787","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T12:54:16+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89513.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89513.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89513"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532187"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89513"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89513"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89513.mbox"},{"url":"https://git.kernel.org/stable/c/735bc20c24187ca419c9d5e63860a54b91be34bd"},{"url":"https://git.kernel.org/stable/c/82088f88c96b99c27a974d09b02c2b133262fadf"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.0012,"epssPercentile":0.02114,"scores":{"vendor":7,"cna":8.8},"ingestedAt":"2026-09-14T15:23:07.475Z","slug":"CVE-2026-89513","body":"## Overview\n\nA flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) component for RISC-V architectures. A malicious guest operating system could exploit an integer overflow vulnerability by providing a crafted number of Performance Monitoring Unit (PMU) events during the SBI PMU EVENT_GET_INFO call. This leads to KVM allocating insufficient memory, resulting in out-of-bounds reads and writes. This memory corruption could allow a malicious guest to cause a denial of service (DoS) or potentially escalate privileges on the host system.\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-2026-89513.json)\n\n**kernel: RISC-V: KVM: Fix PMU event info array size overflow** — 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":206934,"id":"CVE-2026-89513","ts":1789749706648,"field":"cvss","old":"7","new":"5.5"},{"seq":206933,"id":"CVE-2026-89513","ts":1789749706648,"field":"severity","old":"high","new":"medium"},{"seq":203028,"id":"CVE-2026-89513","ts":1789403733410,"field":"cvss","old":"8.8","new":"7"},{"seq":197984,"id":"CVE-2026-89513","ts":1789384321255,"field":"cvss","old":"7","new":"8.8"},{"seq":183773,"id":"CVE-2026-89513","ts":1789356677329,"field":"cvss","old":"8.8","new":"7"},{"seq":153306,"id":"CVE-2026-89513","ts":1789285349971,"field":"cvss","old":null,"new":"8.8"},{"seq":153305,"id":"CVE-2026-89513","ts":1789285349971,"field":"severity","old":"none","new":"high"},{"seq":147628,"id":"CVE-2026-89513","ts":1789270211655,"field":"cvss","old":null,"new":"7"},{"seq":147627,"id":"CVE-2026-89513","ts":1789270211655,"field":"severity","old":"none","new":"high"},{"seq":109380,"id":"CVE-2026-89513","ts":1789183731682,"field":"cvss","old":null,"new":"7"},{"seq":109379,"id":"CVE-2026-89513","ts":1789183731682,"field":"severity","old":"none","new":"high"}]}