CVE-2026-81014 (GCVE-0-2026-81014)
Vulnerability from cvelistv5
Published
2026-09-11 19:43
Modified
2026-10-19 08:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: platform/x86: hp-bioscfg: fix heap OOB read in sk_store() and kek_store() sk_store() and kek_store() strip a trailing newline from the sysfs write before allocating the key buffer: length = count; if (buf[length - 1] == '\n') length--; bioscfg_drv.spm_data.signing_key = kmemdup(buf, length, GFP_KERNEL); but then pass the original "count" (not "length") as the copy size to hp_wmi_perform_query(), which memcpy()s that many bytes out of the "length"-sized allocation, reading one byte past it whenever the write ends in a newline, the normal case for a shell "echo" into sysfs. KASAN confirms this directly: BUG: KASAN: slab-out-of-bounds in hp_wmi_perform_query+0x1e9/0x460 [hp_bioscfg] Read of size 28 at addr ffff88813c8e2b80 by task python3/16022 ... sk_store+0xa7/0x240 [hp_bioscfg] kernfs_fop_write_iter+0x3e1/0x5d0 ... The buggy address is located 0 bytes inside of allocated 27-byte region [ffff88813c8e2b80, ffff88813c8e2b9b) Reproduced identically for kek_store, and at multiple write sizes (28, 57, 201 bytes), each time reading exactly one byte past a kmemdup() allocation one byte smaller than the write. Fix by passing "length" instead of "count" to hp_wmi_perform_query() in both functions.
References
Impacted products
Vendor Product Version
Linux Linux Version: b2715aa2e1352c0060b9dcba57a2e465bbfbcd68
Version: b2715aa2e1352c0060b9dcba57a2e465bbfbcd68
Version: b2715aa2e1352c0060b9dcba57a2e465bbfbcd68
Version: b2715aa2e1352c0060b9dcba57a2e465bbfbcd68
Version: b2715aa2e1352c0060b9dcba57a2e465bbfbcd68
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/platform/x86/hp/hp-bioscfg/spmobj-attributes.c"
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          ],
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              "version": "7.2.4",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.3",
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      ],
      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: hp-bioscfg: fix heap OOB read in sk_store() and kek_store()\n\nsk_store() and kek_store() strip a trailing newline from the sysfs\nwrite before allocating the key buffer:\n\n\tlength = count;\n\tif (buf[length - 1] == \u0027\\n\u0027)\n\t\tlength--;\n\tbioscfg_drv.spm_data.signing_key = kmemdup(buf, length, GFP_KERNEL);\n\nbut then pass the original \"count\" (not \"length\") as the copy size to\nhp_wmi_perform_query(), which memcpy()s that many bytes out of the\n\"length\"-sized allocation, reading one byte past it whenever the write\nends in a newline, the normal case for a shell \"echo\" into sysfs.\n\nKASAN confirms this directly:\n\n  BUG: KASAN: slab-out-of-bounds in hp_wmi_perform_query+0x1e9/0x460 [hp_bioscfg]\n  Read of size 28 at addr ffff88813c8e2b80 by task python3/16022\n  ...\n  sk_store+0xa7/0x240 [hp_bioscfg]\n  kernfs_fop_write_iter+0x3e1/0x5d0\n  ...\n  The buggy address is located 0 bytes inside of\n  allocated 27-byte region [ffff88813c8e2b80, ffff88813c8e2b9b)\n\nReproduced identically for kek_store, and at multiple write sizes\n(28, 57, 201 bytes), each time reading exactly one byte past a\nkmemdup() allocation one byte smaller than the write.\n\nFix by passing \"length\" instead of \"count\" to hp_wmi_perform_query()\nin both functions."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:46:39.559Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/81db79fed115640736188e56595b1e9aec317d5b"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c6374dcb270d12907b880cf82a5a5ef21785fc3"
        },
        {
          "url": "https://git.kernel.org/stable/c/7cd8fe01aba303a2382db0966eb6c8ab41d5f3c2"
        },
        {
          "url": "https://git.kernel.org/stable/c/67b60703d7d8af1ca0e49f72e1bdb1ccecd41b5b"
        },
        {
          "url": "https://git.kernel.org/stable/c/a7508c7959ff8d037327d377ed21a9c0eabe4674"
        }
      ],
      "title": "platform/x86: hp-bioscfg: fix heap OOB read in sk_store() and kek_store()",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-81014",
    "datePublished": "2026-09-11T19:43:03.397Z",
    "dateReserved": "2026-08-26T14:34:25.813Z",
    "dateUpdated": "2026-10-19T08:46:39.559Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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