FKIE_CVE-2026-81013
Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-09-14 13:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
platform/x86: hp-bioscfg: fix heap OOB read on empty password write
validate_password_input() computes length = strlen(buf) and then
checks buf[length - 1] to strip a trailing newline, without checking
that length is nonzero first. Writing an empty string (a bare '\n')
to current_password or new_password gives length == 0, and
buf[length - 1] reads buf[-1], one byte before the heap allocation
holding the copied input.
KASAN confirms this directly:
BUG: KASAN: slab-out-of-bounds in store_password_instance.constprop.0+0x223/0x2a0 [hp_bioscfg]
Read of size 1 at addr ffff88811bd8da9f by task sh/13740
...
store_password_instance.constprop.0+0x223/0x2a0 [hp_bioscfg]
current_password_store+0x14/0x20 [hp_bioscfg]
...
The buggy address is located 23 bytes to the right of
allocated 8-byte region [ffff88811bd8da80, ffff88811bd8da88)
Reproduced identically via new_password_store. Execution continues
past the bad read (the garbage byte only affects whether "length" is
decremented by one), so the write completes and returns success; this
is a pure information read past the buffer, not a crash, but it is
still an out-of-bounds access KASAN correctly flags.
Fix by only checking buf[length - 1] when length is nonzero.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "21243c15e1d31f0df1517435e3a7784747f19043",
"status": "affected",
"version": "8646a3b5ee3a5b384a22a721f37c24274d974045",
"versionType": "git"
},
{
"lessThan": "cecb8154bd5fa6c8ddbd1a4e8216bbc0f0eb9828",
"status": "affected",
"version": "8646a3b5ee3a5b384a22a721f37c24274d974045",
"versionType": "git"
},
{
"lessThan": "0f9aad08424882dd5714b53d29ae044060890752",
"status": "affected",
"version": "8646a3b5ee3a5b384a22a721f37c24274d974045",
"versionType": "git"
},
{
"lessThan": "b699e5c1f63a9e79946c35598c8a6f7af2c356b8",
"status": "affected",
"version": "8646a3b5ee3a5b384a22a721f37c24274d974045",
"versionType": "git"
},
{
"lessThan": "2b2ec354f905c14e3270e8ec3ab50f7d8ad73bab",
"status": "affected",
"version": "8646a3b5ee3a5b384a22a721f37c24274d974045",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.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-rc1",
"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 heap OOB read on empty password write\n\nvalidate_password_input() computes length = strlen(buf) and then\nchecks buf[length - 1] to strip a trailing newline, without checking\nthat length is nonzero first. Writing an empty string (a bare \u0027\\n\u0027)\nto current_password or new_password gives length == 0, and\nbuf[length - 1] reads buf[-1], one byte before the heap allocation\nholding the copied input.\n\nKASAN confirms this directly:\n\n BUG: KASAN: slab-out-of-bounds in store_password_instance.constprop.0+0x223/0x2a0 [hp_bioscfg]\n Read of size 1 at addr ffff88811bd8da9f by task sh/13740\n ...\n store_password_instance.constprop.0+0x223/0x2a0 [hp_bioscfg]\n current_password_store+0x14/0x20 [hp_bioscfg]\n ...\n The buggy address is located 23 bytes to the right of\n allocated 8-byte region [ffff88811bd8da80, ffff88811bd8da88)\n\nReproduced identically via new_password_store. Execution continues\npast the bad read (the garbage byte only affects whether \"length\" is\ndecremented by one), so the write completes and returns success; this\nis a pure information read past the buffer, not a crash, but it is\nstill an out-of-bounds access KASAN correctly flags.\n\nFix by only checking buf[length - 1] when length is nonzero."
}
],
"id": "CVE-2026-81013",
"lastModified": "2026-09-14T13:18:55.720",
"metrics": {},
"published": "2026-09-11T20:19:10.173",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0f9aad08424882dd5714b53d29ae044060890752"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/21243c15e1d31f0df1517435e3a7784747f19043"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/2b2ec354f905c14e3270e8ec3ab50f7d8ad73bab"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b699e5c1f63a9e79946c35598c8a6f7af2c356b8"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/cecb8154bd5fa6c8ddbd1a4e8216bbc0f0eb9828"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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