{"id":"CVE-2026-89486","title":"kernel: ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user() (CVE-2026-89486)","summary":"A flaw was found in the Linux kernel's Intelligent Platform Management Interface (IPMI) subsystem. Due to incorrect synchronization during the deallocation of command receiver objects, a use-after-free vulnerability can occur. This allows …","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-825","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T21:23:38+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89486.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89486.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89486"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532463"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89486"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89486"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89486.mbox"},{"url":"https://git.kernel.org/stable/c/05ec76cfbce653e07cec19b9b8b20e33449d5d87"},{"url":"https://git.kernel.org/stable/c/3088e41292fecf132f85f79af5ee4d620b9ff1b4"},{"url":"https://git.kernel.org/stable/c/5dc0b2a9af95a97861c1bffaf1687a3173e395c5"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00124,"epssPercentile":0.02433,"scores":{"vendor":5.5,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.475Z","slug":"CVE-2026-89486","body":"## Overview\n\nA flaw was found in the Linux kernel's Intelligent Platform Management Interface (IPMI) subsystem. Due to incorrect synchronization during the deallocation of command receiver objects, a use-after-free vulnerability can occur. This allows a freed memory region to be accessed, which could be exploited by a local attacker to cause system instability, a denial of service (DoS), or potentially achieve privilege escalation.\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-2026-89486.json)\n\n**kernel: ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()** — 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":206954,"id":"CVE-2026-89486","ts":1789749717717,"field":"cvss","old":"6.5","new":"5.5"},{"seq":202905,"id":"CVE-2026-89486","ts":1789403732887,"field":"cvss","old":"7.8","new":"6.5"},{"seq":202904,"id":"CVE-2026-89486","ts":1789403732887,"field":"severity","old":"high","new":"medium"},{"seq":198014,"id":"CVE-2026-89486","ts":1789384321387,"field":"cvss","old":"6.5","new":"7.8"},{"seq":198013,"id":"CVE-2026-89486","ts":1789384321387,"field":"severity","old":"medium","new":"high"},{"seq":183523,"id":"CVE-2026-89486","ts":1789356675721,"field":"cvss","old":"7.8","new":"6.5"},{"seq":183522,"id":"CVE-2026-89486","ts":1789356675721,"field":"severity","old":"high","new":"medium"},{"seq":153270,"id":"CVE-2026-89486","ts":1789285349821,"field":"cvss","old":null,"new":"7.8"},{"seq":153269,"id":"CVE-2026-89486","ts":1789285349821,"field":"severity","old":"none","new":"high"},{"seq":147169,"id":"CVE-2026-89486","ts":1789270198584,"field":"cvss","old":null,"new":"6.5"},{"seq":147168,"id":"CVE-2026-89486","ts":1789270198584,"field":"severity","old":"none","new":"medium"},{"seq":108924,"id":"CVE-2026-89486","ts":1789183729567,"field":"cvss","old":null,"new":"6.5"},{"seq":108923,"id":"CVE-2026-89486","ts":1789183729567,"field":"severity","old":"none","new":"medium"}]}