CVE-2026-90137 (GCVE-0-2026-90137)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-10-19 08:58
VLAI
Title
platform/x86: hp-bioscfg: fix password encoding bounds check
Summary
In the Linux kernel, the following vulnerability has been resolved: platform/x86: hp-bioscfg: fix password encoding bounds check The password PSWD_ENCODINGS parser reads password_obj[elem + pos_values] while copying the supported password encodings from the ACPI package. The outer loop only guarantees that elem is within password_obj_count. The encoding count is bounded by MAX_ENCODINGS_SIZE, but that does not guarantee that the ACPI package contains enough entries for all elem + pos_values accesses. A malformed package can therefore declare a non-zero encoding count without providing enough string objects, causing the parser to read past the ACPI package array and pass an out-of-bounds string pointer and length to hp_convert_hexstr_to_str(). Add the same computed-index bounds check used by the other offset-based package parsing loops before reading password_obj[elem + pos_values].
Severity
7.7 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6649 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8646a3b5ee3a5b384a22a721f37c24274d974045 , < c224759555a13735b0d67561d818cefe00c3309a (git)
Affected: 8646a3b5ee3a5b384a22a721f37c24274d974045 , < 59fe8491ddaa03a510b352552e6ee291e7ce45d3 (git)
Affected: 8646a3b5ee3a5b384a22a721f37c24274d974045 , < ace1ba5fca0ab775b3641e154bcbc3ccde26a71a (git)
Affected: 8646a3b5ee3a5b384a22a721f37c24274d974045 , < 8a7499b8fd34438c1b11964e0e7ef5bd590fec92 (git)
Affected: 8646a3b5ee3a5b384a22a721f37c24274d974045 , < e213939ed9e6e6badf7aa48c4c8dd9a9cdf00615 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c"
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      "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": {
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "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-\u003epackage.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\u0027d into password_data-\u003eencodings[] 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()."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:58:35.353Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "platform/x86: hp-bioscfg: fix password encoding bounds check",
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    "cveId": "CVE-2026-90137",
    "datePublished": "2026-09-17T16:06:35.829Z",
    "dateReserved": "2026-09-11T19:38:34.788Z",
    "dateUpdated": "2026-10-19T08:58:35.353Z",
    "state": "PUBLISHED"
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            "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]."
          }
        ],
        "id": "CVE-2026-90137",
        "lastModified": "2026-10-19T09:19:03.463",
        "metrics": {
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            {
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                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.7,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-13T13:24:16+00:00",
      "cve": "CVE-2026-90137",
      "id": "CVE-2026-90137",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_not_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: platform/x86: hp-bioscfg: fix password encoding bounds check",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90137.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T00:46:10Z",
      "cve": "CVE-2026-90137",
      "id": "CVE-2026-90137",
      "initial_release_date": "2026-09-18T00:20:50Z",
      "product_status:known_affected": "0",
      "product_status:known_not_affected": "348",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90137",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-90137.json",
      "version": "5"
    }
  }
}



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