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CVE-2026-81012 (GCVE-0-2026-81012)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 11:59
VLAI
Title
platform/x86: hp-bioscfg: fix off-by-one write in hp_get_string_from_buffer()
Summary
In the Linux kernel, the following vulnerability has been resolved: platform/x86: hp-bioscfg: fix off-by-one write in hp_get_string_from_buffer() hp_get_string_from_buffer() clamps the converted string length against the destination buffer size with "size > dst_size", so when the converted length is exactly equal to dst_size, conv_dst_size is left at dst_size and the unconditional NUL terminator write dst[conv_dst_size] = 0; lands one byte past the destination buffer. This is the same shape of bug as the previously fixed off-by-one in hp_convert_hexstr_to_str(): the buffer is sized correctly for the content, but the terminator write is never checked against that size. Fix by changing the comparison to ">=" so conv_dst_size is always left with room for the terminator. All fixed-size destinations that reach this function (path[512], current_value[512], current_password/current_value[64], and the per-entry buffers in encodings[][512] and prerequisites[][512]) are affected.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a34fc329b1895fc8a6eb12099adc47009421ba6a , < 8f5aa1506cdddea6b33584c2445b9ce99eeddb64 (git)
Affected: a34fc329b1895fc8a6eb12099adc47009421ba6a , < 3cc772d0154799961f032e5a992d4a50523e291a (git)
Affected: a34fc329b1895fc8a6eb12099adc47009421ba6a , < b15b334fbc3c0c46440f8a892ebf62164fca23d6 (git)
Affected: a34fc329b1895fc8a6eb12099adc47009421ba6a , < ddf98cf33529714b3ba1a158afb1db5b0f759a1a (git)
Affected: a34fc329b1895fc8a6eb12099adc47009421ba6a , < dc03f05e419f3460342fb7564884f244622634b6 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "product": "Linux",
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: hp-bioscfg: fix off-by-one write in hp_get_string_from_buffer()\n\nhp_get_string_from_buffer() clamps the converted string length against\nthe destination buffer size with \"size \u003e dst_size\", so when the\nconverted length is exactly equal to dst_size, conv_dst_size is left\nat dst_size and the unconditional NUL terminator write\n\n\tdst[conv_dst_size] = 0;\n\nlands one byte past the destination buffer. This is the same shape of\nbug as the previously fixed off-by-one in hp_convert_hexstr_to_str():\nthe buffer is sized correctly for the content, but the terminator\nwrite is never checked against that size.\n\nFix by changing the comparison to \"\u003e=\" so conv_dst_size is always left\nwith room for the terminator.\n\nAll fixed-size destinations that reach this function (path[512],\ncurrent_value[512], current_password/current_value[64], and the\nper-entry buffers in encodings[][512] and prerequisites[][512]) are\naffected."
        }
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          },
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            {
              "lang": "en",
              "value": "AV:L - hp_get_string_from_buffer() runs during local hp-bioscfg initialization while parsing HP WMI/ACPI BIOS attribute buffers from wmi_query_block(); there is no network, Bluetooth, or USB protocol path into this UTF-16 conversion.\nAC:L - A WMI buffer whose converted string length equals the destination size deterministically writes the NUL terminator one byte past the buffer; firmware controls the length prefix and contents, with no race or attacker-uncontrollable layout required to trigger the overflow.\nPR:N - The overflow executes automatically in hp_init()/hp_init_bios_attributes() while parsing firmware-supplied WMI buffers, with no Linux user account, capability, or sysfs check on that path; a supply-chain or compromised HP BIOS suffices.\nUI:N - Every WMI BIOS attribute instance is parsed automatically at boot or module load; exploitation does not require a victim to mount a filesystem, open a file, or take any other action.\nS:U - The out-of-bounds write corrupts kernel heap or stack in the same host kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The one-byte overflow past heap objects (including a kcalloc buffer sized from the remaining WMI payload) and kernel-stack name buffers corrupts adjacent objects or pointer LSBs, which is leverageable for kernel memory disclosure.\nI:H - This is an out-of-bounds write past fixed-size fields and a separately allocated heap buffer whose size is chosen from the firmware buffer length, giving a slab-adjacent write primitive usable for control-flow hijacking after heap grooming.\nA:H - Writing one byte past a kmalloc object or kernel stack buffer can corrupt adjacent pointers or slab metadata and cause a kernel oops, KASAN abort, or panic during hp-bioscfg bring-up."
            }
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      "title": "platform/x86: hp-bioscfg: fix off-by-one write in hp_get_string_from_buffer()",
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    "datePublished": "2026-09-11T19:43:02.082Z",
    "dateReserved": "2026-08-26T14:34:25.813Z",
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          }
        ],
        "id": "CVE-2026-81012",
        "lastModified": "2026-09-14T13:18:55.597",
        "metrics": {
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
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        "vulnStatus": "Received"
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    "redhat_vex": {
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      "current_release_date": "2026-09-14T21:17:50+00:00",
      "cve": "CVE-2026-81012",
      "id": "CVE-2026-81012",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_not_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: platform/x86: hp-bioscfg: fix off-by-one write in hp_get_string_from_buffer()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81012.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:04:04Z",
      "cve": "CVE-2026-81012",
      "id": "CVE-2026-81012",
      "initial_release_date": "2026-09-12T16:35:33Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-81012",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-81012.json",
      "version": "4"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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