CVE-2026-81012

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-81012", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.813Z", "datePublished": "2026-09-11T19:43:02.082Z", "dateUpdated": "2026-10-19T08:46:37.440Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:46:37.440Z"}, "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 > 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 \">=\" 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."}], "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 - 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."}]}], "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/bioscfg.c"], "versions": [{"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a", "lessThan": "8f5aa1506cdddea6b33584c2445b9ce99eeddb64", "status": "affected", "versionType": "git"}, {"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a", "lessThan": "3cc772d0154799961f032e5a992d4a50523e291a", "status": "affected", "versionType": "git"}, {"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a", "lessThan": "b15b334fbc3c0c46440f8a892ebf62164fca23d6", "status": "affected", "versionType": "git"}, {"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a", "lessThan": "ddf98cf33529714b3ba1a158afb1db5b0f759a1a", "status": "affected", "versionType": "git"}, {"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a", "lessThan": "dc03f05e419f3460342fb7564884f244622634b6", "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/bioscfg.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": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "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": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8f5aa1506cdddea6b33584c2445b9ce99eeddb64"}, {"url": "https://git.kernel.org/stable/c/3cc772d0154799961f032e5a992d4a50523e291a"}, {"url": "https://git.kernel.org/stable/c/b15b334fbc3c0c46440f8a892ebf62164fca23d6"}, {"url": "https://git.kernel.org/stable/c/ddf98cf33529714b3ba1a158afb1db5b0f759a1a"}, {"url": "https://git.kernel.org/stable/c/dc03f05e419f3460342fb7564884f244622634b6"}], "title": "platform/x86: hp-bioscfg: fix off-by-one write in hp_get_string_from_buffer()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/platform/x86/hp/hp-bioscfg/bioscfg.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8f5aa1506cdddea6b33584c2445b9ce99eeddb64", "status": "affected", "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a", "versionType": "git"}, {"lessThan": "3cc772d0154799961f032e5a992d4a50523e291a", "status": "affected", "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a", "versionType": "git"}, {"lessThan": "b15b334fbc3c0c46440f8a892ebf62164fca23d6", "status": "affected", "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a", "versionType": "git"}, {"lessThan": "ddf98cf33529714b3ba1a158afb1db5b0f759a1a", "status": "affected", "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a", "versionType": "git"}, {"lessThan": "dc03f05e419f3460342fb7564884f244622634b6", "status": "affected", "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/platform/x86/hp/hp-bioscfg/bioscfg.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.6"}, {"lessThan": "6.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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 > 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 \">=\" 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."}], "id": "CVE-2026-81012", "lastModified": "2026-10-19T09:17:34.627", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:10.050", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3cc772d0154799961f032e5a992d4a50523e291a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8f5aa1506cdddea6b33584c2445b9ce99eeddb64"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b15b334fbc3c0c46440f8a892ebf62164fca23d6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dc03f05e419f3460342fb7564884f244622634b6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ddf98cf33529714b3ba1a158afb1db5b0f759a1a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel hp-bioscfg: Buffer overflow due to off-by-one write", "id": "2532131", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532131"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-193", "details": ["A flaw was found in the Linux kernel's hp-bioscfg component. The `hp_get_string_from_buffer()` function contains an off-by-one write vulnerability. This occurs because the NUL terminator can be written one byte beyond the allocated buffer, leading to a buffer overflow. An attacker could potentially exploit this to cause memory corruption."], "name": "CVE-2026-81012", "public_date": "2026-09-11T19:43:02Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-81012\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-81012\nhttps://git.kernel.org/stable/c/3cc772d0154799961f032e5a992d4a50523e291a\nhttps://git.kernel.org/stable/c/b15b334fbc3c0c46440f8a892ebf62164fca23d6\nhttps://git.kernel.org/stable/c/dc03f05e419f3460342fb7564884f244622634b6\nhttps://git.kernel.org/stable/c/ddf98cf33529714b3ba1a158afb1db5b0f759a1a"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a34fc329b1895fc8a6eb12099adc47009421ba6a,3cc772d0154799961f032e5a992d4a50523e291a]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a34fc329b1895fc8a6eb12099adc47009421ba6a,b15b334fbc3c0c46440f8a892ebf62164fca23d6]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a34fc329b1895fc8a6eb12099adc47009421ba6a,ddf98cf33529714b3ba1a158afb1db5b0f759a1a]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a34fc329b1895fc8a6eb12099adc47009421ba6a,dc03f05e419f3460342fb7564884f244622634b6]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T03:15:06.702032+00:00", "updated": "2026-09-21T02:45:08.180658+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}