{"id":"CVE-2026-89588","title":"ACPI: APEI: GHES: fix ARM section length accounting after header","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: APEI: GHES: fix ARM section length accounting after header\n\nIn ghes_handle_arm_hw_error(), after skipping the cper_sec_proc_arm\nheader with (err + 1), the remaini…","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-125"],"vendor":"Linux","product":"Linux","affected":["Linux >= 242c652849d979d0133c315a42d9acea0ff88390 < 5ff385e9403e87ae33f65b8c38698d3b1e92cfde","Linux >= 136093ba4161e0080088abff48273f6830a47766 < 452eb28e03015abec6d4bf6488ee567706ade4e1","Linux >= 87880af2d24e62a84ed19943dbdd524f097172f2 < b48b613073c3d652cb1823c15d16f7067cf4cee4","Linux >= 87880af2d24e62a84ed19943dbdd524f097172f2 < 903308ea40adf0577d82eab69882faf8836326ce","Linux db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd","Linux >= 6.12.75 < 6.12.109","Linux >= 6.18.16 < 6.18.50","Linux >= 6.19.6 < 6.20","Linux 7.0"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:49:20.945Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89588","references":[{"url":"https://git.kernel.org/stable/c/5ff385e9403e87ae33f65b8c38698d3b1e92cfde"},{"url":"https://git.kernel.org/stable/c/452eb28e03015abec6d4bf6488ee567706ade4e1"},{"url":"https://git.kernel.org/stable/c/b48b613073c3d652cb1823c15d16f7067cf4cee4"},{"url":"https://git.kernel.org/stable/c/903308ea40adf0577d82eab69882faf8836326ce"},{"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"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00185,"epssPercentile":0.08012,"scores":{"cna":8.4,"vendor":5.5},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89588","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nACPI: APEI: GHES: fix ARM section length accounting after header\n\nIn ghes_handle_arm_hw_error(), after skipping the cper_sec_proc_arm\nheader with (err + 1), the remaining length was reduced by sizeof(err)\n(pointer size) instead of sizeof(*err) (structure size).\n\nThat overestimates the bytes left for cper_arm_err_info records and can\nlet the parser read past the CPER section when err_info_num is large\nenough relative to error_data_length.\n\nUse sizeof(*err) so the length accounting matches the pointer advance\nand the earlier sizeof(*err) size check.\n\n## Affected\n\n- `Linux >= 242c652849d979d0133c315a42d9acea0ff88390 < 5ff385e9403e87ae33f65b8c38698d3b1e92cfde`\n- `Linux >= 136093ba4161e0080088abff48273f6830a47766 < 452eb28e03015abec6d4bf6488ee567706ade4e1`\n- `Linux >= 87880af2d24e62a84ed19943dbdd524f097172f2 < b48b613073c3d652cb1823c15d16f7067cf4cee4`\n- `Linux >= 87880af2d24e62a84ed19943dbdd524f097172f2 < 903308ea40adf0577d82eab69882faf8836326ce`\n- `Linux db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd`\n- `Linux >= 6.12.75 < 6.12.109`\n- `Linux >= 6.18.16 < 6.18.50`\n- `Linux >= 6.19.6 < 6.20`\n- `Linux 7.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\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)","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224694,"id":"CVE-2026-89588","ts":1792401476016,"field":"cvss","old":"5.5","new":"8.4"},{"seq":224693,"id":"CVE-2026-89588","ts":1792401476016,"field":"severity","old":"medium","new":"high"},{"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"}]}