{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90137", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.788Z", "datePublished": "2026-09-17T16:06:35.829Z", "dateUpdated": "2026-10-19T08:58:35.353Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:58:35.353Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: hp-bioscfg: fix password encoding bounds check\n\nThe password PSWD_ENCODINGS parser reads password_obj[elem + pos_values]\nwhile copying the supported password encodings from the ACPI package.\n\nThe outer loop only guarantees that elem is within password_obj_count.\nThe encoding count is bounded by MAX_ENCODINGS_SIZE, but that does not\nguarantee that the ACPI package contains enough entries for all\nelem + pos_values accesses.\n\nA malformed package can therefore declare a non-zero encoding count\nwithout providing enough string objects, causing the parser to read past\nthe ACPI package array and pass an out-of-bounds string pointer and\nlength to hp_convert_hexstr_to_str().\n\nAdd the same computed-index bounds check used by the other offset-based\npackage parsing loops before reading password_obj[elem + pos_values]." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.7, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The malformed bytes are the ACPI package from wmi_query_block() on HP_WMI_BIOS_PASSWORD_GUID, walked by hp_populate_password_elements_from_package() during hp_init()/hp_init_bios_attributes(); that is local HP WMI/ACPI firmware data, not a network, Bluetooth/WiFi, or USB protocol message.\nAC:L - A password package whose PSWD_SIZE/encodings_size is non-zero but that lacks encodings_size string objects makes the PSWD_ENCODINGS loop read password_obj[elem+pos_values] past password_obj_count on every probe; firmware sets both the count and the package length, with no race required.\nPR:N - hp_init() calls hp_init_bios_attributes(HPWMI_PASSWORD_TYPE) and hp_populate_password_elements_from_package() with no capable(), credential, or sysfs check; a compromised HP BIOS that returns a short password package triggers the PSWD_ENCODINGS over-read at module init without a Linux user account.\nUI:N - HP_WMI_BIOS_PASSWORD_GUID instances are enumerated automatically in hp_init() when HP_WMI_BIOS_GUID is present (module_init/built-in probe); the victim does not need to write current_password/new_password, mount a filesystem, or take any other action.\nS:U - The over-read is of the kernel heap array obj->package.elements and any oops or copied encodings stay in the same host kernel authority; this WMI password parser is not a KVM/Xen guest-to-host or IOMMU/DMA boundary crossing.\nC:H - Each out-of-bounds slot is treated as string.pointer and string.length and passed to hp_convert_hexstr_to_str(), which kmallocs that length and reads the pointer; the result is strscpy'd into password_data->encodings[] and emitted by the 0444 encodings sysfs show, so the read is not a few bounded bytes.\nI:N - The PSWD_ENCODINGS loop only reads out-of-bounds union acpi_object fields and then 2-argument strscpy()s the conversion into encodings[MAX_ENCODINGS_SIZE][MAX_BUFF_SIZE]; parsed results never write past that fixed array, so there is no OOB write or control-flow hijack primitive.\nA:H - hp_convert_hexstr_to_str() dereferences password_obj[elem+pos_values].string.pointer; an invalid pointer taken from an out-of-bounds ACPI package slot causes a kernel oops or panic while enumerating HP_WMI_BIOS_PASSWORD_GUID instances in hp_init()." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c" ], "versions": [ { "version": "8646a3b5ee3a5b384a22a721f37c24274d974045", "lessThan": "c224759555a13735b0d67561d818cefe00c3309a", "status": "affected", "versionType": "git" }, { "version": "8646a3b5ee3a5b384a22a721f37c24274d974045", "lessThan": "59fe8491ddaa03a510b352552e6ee291e7ce45d3", "status": "affected", "versionType": "git" }, { "version": "8646a3b5ee3a5b384a22a721f37c24274d974045", "lessThan": "ace1ba5fca0ab775b3641e154bcbc3ccde26a71a", "status": "affected", "versionType": "git" }, { "version": "8646a3b5ee3a5b384a22a721f37c24274d974045", "lessThan": "8a7499b8fd34438c1b11964e0e7ef5bd590fec92", "status": "affected", "versionType": "git" }, { "version": "8646a3b5ee3a5b384a22a721f37c24274d974045", "lessThan": "e213939ed9e6e6badf7aa48c4c8dd9a9cdf00615", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "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": "6.6", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c224759555a13735b0d67561d818cefe00c3309a" }, { "url": "https://git.kernel.org/stable/c/59fe8491ddaa03a510b352552e6ee291e7ce45d3" }, { "url": "https://git.kernel.org/stable/c/ace1ba5fca0ab775b3641e154bcbc3ccde26a71a" }, { "url": "https://git.kernel.org/stable/c/8a7499b8fd34438c1b11964e0e7ef5bd590fec92" }, { "url": "https://git.kernel.org/stable/c/e213939ed9e6e6badf7aa48c4c8dd9a9cdf00615" } ], "title": "platform/x86: hp-bioscfg: fix password encoding bounds check", "x_generator": { "engine": "bippy-1.2.0" } } } }