208 lines
11 KiB
JSON
208 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-89588",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.729Z",
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"datePublished": "2026-09-11T19:44:52.842Z",
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"dateUpdated": "2026-10-19T08:49:20.945Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:49:20.945Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.4,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/acpi/apei/ghes.c"
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],
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"versions": [
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{
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"version": "242c652849d979d0133c315a42d9acea0ff88390",
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"lessThan": "5ff385e9403e87ae33f65b8c38698d3b1e92cfde",
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"status": "affected",
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"versionType": "git"
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},
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"version": "136093ba4161e0080088abff48273f6830a47766",
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"lessThan": "452eb28e03015abec6d4bf6488ee567706ade4e1",
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"status": "affected",
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{
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"lessThan": "b48b613073c3d652cb1823c15d16f7067cf4cee4",
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"status": "affected",
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"versionType": "git"
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{
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"lessThan": "903308ea40adf0577d82eab69882faf8836326ce",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.12.75",
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"lessThan": "6.12.109",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.18.16",
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"lessThan": "6.18.50",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.19.6",
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"lessThan": "6.20",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/acpi/apei/ghes.c"
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],
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"versions": [
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{
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"version": "7.0",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "7.0",
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"status": "unaffected",
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},
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{
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"version": "6.12.109",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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},
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{
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"version": "6.18.50",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/5ff385e9403e87ae33f65b8c38698d3b1e92cfde"
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},
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{
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"url": "https://git.kernel.org/stable/c/452eb28e03015abec6d4bf6488ee567706ade4e1"
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{
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"url": "https://git.kernel.org/stable/c/b48b613073c3d652cb1823c15d16f7067cf4cee4"
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{
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"url": "https://git.kernel.org/stable/c/903308ea40adf0577d82eab69882faf8836326ce"
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}
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],
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"title": "ACPI: APEI: GHES: fix ARM section length accounting after header",
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