{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89904", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.774Z", "datePublished": "2026-09-16T10:32:03.752Z", "dateUpdated": "2026-10-19T08:54:37.029Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:54:37.029Z" }, "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": { "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 - 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/loongarch/kernel/acpi.c" ], "versions": [ { "version": "f18992be262d6515c94bf4bf6ce7598135076771", "lessThan": "0195e04b1eec8fb00e2db9c5e55655a3f5e76f60", "status": "affected", "versionType": "git" }, { "version": "4427a33faabb4b81511b99dfee18ce0a38b5b5df", "lessThan": "d3fd094c13c6d0b74f246461ca4cf427d539c8e8", "status": "affected", "versionType": "git" }, { "version": "4e8f58620f6717f72f3d88a2c8f25c0c656d0ba7", "lessThan": "6311b8c471afa33c18adbe4eb16f862936b71ca3", "status": "affected", "versionType": "git" }, { "version": "4e8f58620f6717f72f3d88a2c8f25c0c656d0ba7", "lessThan": "2a2367d46d7a4ee4122b7a86e57125542dbbe963", "status": "affected", "versionType": "git" }, { "version": "496bc868d9066e034787aa14b8ad6c23e77b51ef", "status": "affected", "versionType": "git" }, { "version": "6.12.101", "lessThan": "6.12.110", "status": "affected", "versionType": "semver" }, { "version": "6.18.42", "lessThan": "6.18.51", "status": "affected", "versionType": "semver" }, { "version": "7.1.6", "lessThan": "7.2", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/loongarch/kernel/acpi.c" ], "versions": [ { "version": "7.2", "status": "affected" }, { "version": "0", "lessThan": "7.2", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.5", "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": "6.12.101", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.42", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.2", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.2", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1.6" } ] } ] } ], "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" } } } }