platform/x86: hp-bioscfg: fix off-by-one write in hp_get_string_from_buffer()
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.
CVE-2026-81012
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-81012
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
"lessThan": "8f5aa1506cdddea6b33584c2445b9ce99eeddb64",
"versionType": "git"
},
{
"status": "affected",
"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
"lessThan": "3cc772d0154799961f032e5a992d4a50523e291a",
"versionType": "git"
},
{
"status": "affected",
"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
"lessThan": "b15b334fbc3c0c46440f8a892ebf62164fca23d6",
"versionType": "git"
},
{
"status": "affected",
"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
"lessThan": "ddf98cf33529714b3ba1a158afb1db5b0f759a1a",
"versionType": "git"
},
{
"status": "affected",
"version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
"lessThan": "dc03f05e419f3460342fb7564884f244622634b6",
"versionType": "git"
}
],
"programFiles": [
"drivers/platform/x86/hp/hp-bioscfg/bioscfg.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/platform/x86/hp/hp-bioscfg/bioscfg.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-81012
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34967 · Revision 1
- Added to Heist Feed
- Publisher date