{"id":"CVE-2026-89588","title":"kernel: ACPI: APEI: GHES: fix ARM section length accounting after header (CVE-2026-89588)","summary":"A flaw was found in the Linux kernel's Advanced Configuration and Power Interface (ACPI) APEI Generic Hardware Error Source (GHES) component. Incorrect length accounting in the `ghes_handle_arm_hw_error()` function can lead to the parser r…","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-125","vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","affected":["enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T12:46:43+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89588.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89588.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89588"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532442"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89588"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89588"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89588.mbox"},{"url":"https://git.kernel.org/stable/c/452eb28e03015abec6d4bf6488ee567706ade4e1"},{"url":"https://git.kernel.org/stable/c/5ff385e9403e87ae33f65b8c38698d3b1e92cfde"},{"url":"https://git.kernel.org/stable/c/903308ea40adf0577d82eab69882faf8836326ce"},{"url":"https://git.kernel.org/stable/c/b48b613073c3d652cb1823c15d16f7067cf4cee4"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00182,"epssPercentile":0.08074,"scores":{"vendor":5.1,"cna":8.4},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89588","body":"## Overview\n\nA flaw was found in the Linux kernel's Advanced Configuration and Power Interface (ACPI) APEI Generic Hardware Error Source (GHES) component. Incorrect length accounting in the `ghes_handle_arm_hw_error()` function can lead to the parser reading beyond the allocated memory section. This out-of-bounds read could potentially result in a denial of service or information disclosure.\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 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89588.json)\n\n**kernel: ACPI: APEI: GHES: fix ARM section length accounting after header** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\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":203886,"id":"CVE-2026-89588","ts":1789490210948,"field":"cvss","old":"5.1","new":"5.5"},{"seq":202867,"id":"CVE-2026-89588","ts":1789403732733,"field":"cvss","old":"8.4","new":"5.1"},{"seq":202866,"id":"CVE-2026-89588","ts":1789403732733,"field":"severity","old":"high","new":"medium"},{"seq":197884,"id":"CVE-2026-89588","ts":1789384320806,"field":"cvss","old":"5.1","new":"8.4"},{"seq":197883,"id":"CVE-2026-89588","ts":1789384320806,"field":"severity","old":"medium","new":"high"},{"seq":183443,"id":"CVE-2026-89588","ts":1789356675389,"field":"cvss","old":"8.4","new":"5.1"},{"seq":183442,"id":"CVE-2026-89588","ts":1789356675389,"field":"severity","old":"high","new":"medium"},{"seq":153408,"id":"CVE-2026-89588","ts":1789285350393,"field":"cvss","old":null,"new":"8.4"},{"seq":153407,"id":"CVE-2026-89588","ts":1789285350393,"field":"severity","old":"none","new":"high"},{"seq":147203,"id":"CVE-2026-89588","ts":1789270200966,"field":"cvss","old":null,"new":"5.1"},{"seq":147202,"id":"CVE-2026-89588","ts":1789270200966,"field":"severity","old":"none","new":"medium"},{"seq":108956,"id":"CVE-2026-89588","ts":1789183729726,"field":"cvss","old":null,"new":"5.1"},{"seq":108955,"id":"CVE-2026-89588","ts":1789183729726,"field":"severity","old":"none","new":"medium"}]}