201 lines
11 KiB
JSON
201 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-81012",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-26T14:34:25.813Z",
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"datePublished": "2026-09-11T19:43:02.082Z",
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"dateUpdated": "2026-10-19T08:46:37.440Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:46:37.440Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.4,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/platform/x86/hp/hp-bioscfg/bioscfg.c"
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],
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"versions": [
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{
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"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
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"lessThan": "8f5aa1506cdddea6b33584c2445b9ce99eeddb64",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
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"lessThan": "3cc772d0154799961f032e5a992d4a50523e291a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
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"lessThan": "b15b334fbc3c0c46440f8a892ebf62164fca23d6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
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"lessThan": "ddf98cf33529714b3ba1a158afb1db5b0f759a1a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
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"lessThan": "dc03f05e419f3460342fb7564884f244622634b6",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/platform/x86/hp/hp-bioscfg/bioscfg.c"
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],
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"versions": [
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{
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"version": "6.6",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.6",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.157",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.109",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.50",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "6.6.157"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "6.12.109"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "6.18.50"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "7.2.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/8f5aa1506cdddea6b33584c2445b9ce99eeddb64"
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},
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{
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"url": "https://git.kernel.org/stable/c/3cc772d0154799961f032e5a992d4a50523e291a"
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},
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{
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"url": "https://git.kernel.org/stable/c/b15b334fbc3c0c46440f8a892ebf62164fca23d6"
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},
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{
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"url": "https://git.kernel.org/stable/c/ddf98cf33529714b3ba1a158afb1db5b0f759a1a"
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},
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{
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"url": "https://git.kernel.org/stable/c/dc03f05e419f3460342fb7564884f244622634b6"
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}
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],
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"title": "platform/x86: hp-bioscfg: fix off-by-one write in hp_get_string_from_buffer()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |