{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89588", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.729Z", "datePublished": "2026-09-11T19:44:52.842Z", "dateUpdated": "2026-10-19T08:49:20.945Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:49:20.945Z" }, "descriptions": [ { "lang": "en", "value": "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 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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - GHES ARM processor CPER sections are consumed on the local host from ACPI APEI notifications (SCI, GSIV, GPIO, SEA, SDEI, NMI, or poll) via ghes_proc()/ghes_proc_in_irq() into ghes_handle_arm_hw_error(); there is no network or radio path. The most severe case is a local ARM server or VM whose firmware delivers a crafted ARM section.\nAC:L - After skipping the cper_sec_proc_arm header, remaining length was reduced by sizeof(pointer) (8) instead of sizeof(*err) (40), over-counting by 32 bytes. A recoverable ARM section with err_info_num large relative to error_data_length then deterministically parses past the section; no race or attacker-uncontrollable layout is required.\nPR:N - ghes_do_proc() and ghes_handle_arm_hw_error() apply no capability or credential check; firmware-first RAS notifications are processed in IRQ, NMI, or kworker context without a host login. Compromised ACPI/SDEI firmware or a BMC-written GHES status block needs no Linux account, matching other firmware-sourced kernel CNA scores.\nUI:N - GHES consumes the CPER record automatically on the notification and irq_work path. No victim action such as mounting a filesystem, opening a device node, or confirming a prompt is required.\nS:U - The out-of-bounds parse and any memory_failure() side effects remain in the host kernel that handles GHES. This is not a KVM/Xen guest-to-host escape or an IOMMU/DMA boundary bypass.\nC:H - The inflated remaining length lets the parser read a cper_arm_err_info object past the CPER section. On the SEA/NMI path the estatus node is allocated to the exact CPER size, so this is a kernel gen_pool/heap out-of-bounds read of adjacent objects, including pointers.\nI:H - Out-of-bounds err_info fields are interpreted as a processor cache-error record; if type and validation_bits match, ghes_do_memory_failure() poisons err_info->physical_fault_addr taken from adjacent memory. Firmware-controlled neighboring bytes thus yield a kernel integrity primitive via HWPoison of arbitrary PFNs.\nA:H - Reading past an exact-sized ghes_estatus_pool node can hit unmapped memory and oops, as the related ARM GHES parser already did on QEMU. memory_failure() of kernel pages or a large err_info_num walk in IRQ context can panic or hang, and notifications can be repeated." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/acpi/apei/ghes.c" ], "versions": [ { "version": "242c652849d979d0133c315a42d9acea0ff88390", "lessThan": "5ff385e9403e87ae33f65b8c38698d3b1e92cfde", "status": "affected", "versionType": "git" }, { "version": "136093ba4161e0080088abff48273f6830a47766", "lessThan": "452eb28e03015abec6d4bf6488ee567706ade4e1", "status": "affected", "versionType": "git" }, { "version": "87880af2d24e62a84ed19943dbdd524f097172f2", "lessThan": "b48b613073c3d652cb1823c15d16f7067cf4cee4", "status": "affected", "versionType": "git" }, { "version": "87880af2d24e62a84ed19943dbdd524f097172f2", "lessThan": "903308ea40adf0577d82eab69882faf8836326ce", "status": "affected", "versionType": "git" }, { "version": "db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd", "status": "affected", "versionType": "git" }, { "version": "6.12.75", "lessThan": "6.12.109", "status": "affected", "versionType": "semver" }, { "version": "6.18.16", "lessThan": "6.18.50", "status": "affected", "versionType": "semver" }, { "version": "6.19.6", "lessThan": "6.20", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/acpi/apei/ghes.c" ], "versions": [ { "version": "7.0", "status": "affected" }, { "version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.75", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.16", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.6" } ] } ] } ], "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" } ], "title": "ACPI: APEI: GHES: fix ARM section length accounting after header", "x_generator": { "engine": "bippy-1.2.0" } } } }