{"api_version":"1","generated_at":"2026-10-03T13:38:48+00:00","cve":"CVE-2026-89904","urls":{"html":"https://cve.report/CVE-2026-89904","api":"https://cve.report/api/cve/CVE-2026-89904.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89904","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89904"},"summary":{"title":"LoongArch: Fix acpi_package_ids[] array overflow","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Fix acpi_package_ids[] array overflow\n\nWith LoongArch virt machine, a typical setting is one core per socket,\nthere will max 256 sockets (packages) on one VM. With PPTT acpi table,\narray acpi_package_ids[] will be overflowed.\n\nHere change the array size of acpi_package_ids[] with the max value of\nMAX_PACKAGES and KVM_MAX_VCPUS.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-16 11:16:59","updated_at":"2026-09-16 15:18:16"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/2a2367d46d7a4ee4122b7a86e57125542dbbe963","name":"https://git.kernel.org/stable/c/2a2367d46d7a4ee4122b7a86e57125542dbbe963","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d3fd094c13c6d0b74f246461ca4cf427d539c8e8","name":"https://git.kernel.org/stable/c/d3fd094c13c6d0b74f246461ca4cf427d539c8e8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0195e04b1eec8fb00e2db9c5e55655a3f5e76f60","name":"https://git.kernel.org/stable/c/0195e04b1eec8fb00e2db9c5e55655a3f5e76f60","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6311b8c471afa33c18adbe4eb16f862936b71ca3","name":"https://git.kernel.org/stable/c/6311b8c471afa33c18adbe4eb16f862936b71ca3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89904","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89904","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f18992be262d6515c94bf4bf6ce7598135076771 0195e04b1eec8fb00e2db9c5e55655a3f5e76f60 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4427a33faabb4b81511b99dfee18ce0a38b5b5df d3fd094c13c6d0b74f246461ca4cf427d539c8e8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4e8f58620f6717f72f3d88a2c8f25c0c656d0ba7 6311b8c471afa33c18adbe4eb16f862936b71ca3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4e8f58620f6717f72f3d88a2c8f25c0c656d0ba7 2a2367d46d7a4ee4122b7a86e57125542dbbe963 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 496bc868d9066e034787aa14b8ad6c23e77b51ef git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.101 6.12.110 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.42 6.18.51 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.1.6 7.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.2","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.51 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.5 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/loongarch/kernel/acpi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0195e04b1eec8fb00e2db9c5e55655a3f5e76f60","status":"affected","version":"f18992be262d6515c94bf4bf6ce7598135076771","versionType":"git"},{"lessThan":"d3fd094c13c6d0b74f246461ca4cf427d539c8e8","status":"affected","version":"4427a33faabb4b81511b99dfee18ce0a38b5b5df","versionType":"git"},{"lessThan":"6311b8c471afa33c18adbe4eb16f862936b71ca3","status":"affected","version":"4e8f58620f6717f72f3d88a2c8f25c0c656d0ba7","versionType":"git"},{"lessThan":"2a2367d46d7a4ee4122b7a86e57125542dbbe963","status":"affected","version":"4e8f58620f6717f72f3d88a2c8f25c0c656d0ba7","versionType":"git"},{"status":"affected","version":"496bc868d9066e034787aa14b8ad6c23e77b51ef","versionType":"git"},{"lessThan":"6.12.110","status":"affected","version":"6.12.101","versionType":"semver"},{"lessThan":"6.18.51","status":"affected","version":"6.18.42","versionType":"semver"},{"lessThan":"7.2","status":"affected","version":"7.1.6","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/loongarch/kernel/acpi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.2"},{"lessThan":"7.2","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.51","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"6.12.101","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.51","versionStartIncluding":"6.18.42","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.5","versionStartIncluding":"7.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"7.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.1.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Fix acpi_package_ids[] array overflow\n\nWith LoongArch virt machine, a typical setting is one core per socket,\nthere will max 256 sockets (packages) on one VM. With PPTT acpi table,\narray acpi_package_ids[] will be overflowed.\n\nHere change the array size of acpi_package_ids[] with the max value of\nMAX_PACKAGES and KVM_MAX_VCPUS."}],"metrics":[{"cvssV3_1":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The overflow is in parse_acpi_topology(), called from loongson_prepare_cpus() during smp_prepare_cpus() as the kernel consumes the firmware or VMM ACPI PPTT table at boot; there is no network, adjacent-network, or USB path into this parser.\nAC:L - A LoongArch virt machine with the typical one-core-per-socket layout can expose up to 256 packages (KVM_MAX_VCPUS) against acpi_package_ids[MAX_PACKAGES] (16 entries); each new PPTT package ID is stored via acpi_package_ids[acpi_nr_packages++] with no bounds check, so the overflow is deterministic with no race.\nPR:N - PPTT is parsed automatically during SMP bring-up with no capable() check, Linux login, or syscall. A hypervisor-generated virt-machine table or supply-chain/evil-maid firmware with more than 16 unique packages triggers the write without any account or user-namespace privilege.\nUI:N - The out-of-bounds write runs as part of ordinary kernel_init_freeable() SMP setup before userspace starts; no victim mount, file open, or other interactive action is required.\nS:U - The write corrupts kernel BSS and related globals inside the same kernel that parsed PPTT. This is not a KVM guest-to-host escape, sandbox breakout, or IOMMU/DMA authority crossing.\nC:H - Firmware-controlled 32-bit topology IDs are written past acpi_package_ids[] into adjacent kernel BSS, and the later canonicalization loop also reads past the array. Per memory-corruption guidance that is High confidentiality, not a bounded few-byte leak.\nI:H - This is a direct out-of-bounds write of firmware-controlled ints past a 16-entry static array (up to hundreds of stores on large VMs). Out-of-bounds writes score High because they can smash adjacent BSS, including function pointers, and enable control-flow hijack.\nA:H - Smashing kernel BSS during SMP bring-up can oops, panic, or prevent boot. Canonicalized package IDs >= MAX_PACKAGES also index loongson3_cpufreq's cpufreq_mutex[MAX_PACKAGES] out of bounds, causing further crashes."}]}],"providerMetadata":{"dateUpdated":"2026-09-16T14:39:54.093Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0195e04b1eec8fb00e2db9c5e55655a3f5e76f60"},{"url":"https://git.kernel.org/stable/c/d3fd094c13c6d0b74f246461ca4cf427d539c8e8"},{"url":"https://git.kernel.org/stable/c/6311b8c471afa33c18adbe4eb16f862936b71ca3"},{"url":"https://git.kernel.org/stable/c/2a2367d46d7a4ee4122b7a86e57125542dbbe963"}],"title":"LoongArch: Fix acpi_package_ids[] array overflow","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89904","datePublished":"2026-09-16T10:32:03.752Z","dateReserved":"2026-09-11T19:38:34.774Z","dateUpdated":"2026-09-16T14:39:54.093Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 11:16:59","lastModifiedDate":"2026-09-16 15:18:16","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89904","Ordinal":"1","Title":"LoongArch: Fix acpi_package_ids[] array overflow","CVE":"CVE-2026-89904","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89904","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Fix acpi_package_ids[] array overflow\n\nWith LoongArch virt machine, a typical setting is one core per socket,\nthere will max 256 sockets (packages) on one VM. With PPTT acpi table,\narray acpi_package_ids[] will be overflowed.\n\nHere change the array size of acpi_package_ids[] with the max value of\nMAX_PACKAGES and KVM_MAX_VCPUS.","Type":"Description","Title":"LoongArch: Fix acpi_package_ids[] array overflow"}]}}}