platform/x86: hp-bioscfg: fix heap OOB read on empty password write
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.
CVE-2026-81013
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-2026-81013
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": "8646a3b5ee3a5b384a22a721f37c24274d974045",
"lessThan": "21243c15e1d31f0df1517435e3a7784747f19043",
"versionType": "git"
},
{
"status": "affected",
"version": "8646a3b5ee3a5b384a22a721f37c24274d974045",
"lessThan": "cecb8154bd5fa6c8ddbd1a4e8216bbc0f0eb9828",
"versionType": "git"
},
{
"status": "affected",
"version": "8646a3b5ee3a5b384a22a721f37c24274d974045",
"lessThan": "0f9aad08424882dd5714b53d29ae044060890752",
"versionType": "git"
},
{
"status": "affected",
"version": "8646a3b5ee3a5b384a22a721f37c24274d974045",
"lessThan": "b699e5c1f63a9e79946c35598c8a6f7af2c356b8",
"versionType": "git"
},
{
"status": "affected",
"version": "8646a3b5ee3a5b384a22a721f37c24274d974045",
"lessThan": "2b2ec354f905c14e3270e8ec3ab50f7d8ad73bab",
"versionType": "git"
}
],
"programFiles": [
"drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.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/passwdobj-attributes.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-81013
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34968 · Revision 1
- Added to Heist Feed
- Publisher date