High severity · published Sep 11, 2026
CVE-2026-81012
platform/x86: hp-bioscfg: fix off-by-one write in hp_get_string_from_buffer()
8.4
CVSS
0.1%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
a34fc329b1895fc8a6eb12099adc47009421ba6a before 8f5aa1506cdddea6b33584c2445b9ce99eeddb64; a34fc329b1895fc8a6eb12099adc47009421ba6a before 3cc772d0154799961f032e5a992d4a50523e291a; a34fc329b1895fc8a6eb12099adc47009421ba6a before b15b334fbc3c0c46440f8a892ebf62164fca23d6; a34fc329b1895fc8a6eb12099adc47009421ba6a before ddf98cf33529714b3ba1a158afb1db5b0f759a1a; a34fc329b1895fc8a6eb12099adc47009421ba6a before dc03f05e419f3460342fb7564884f244622634b6; 6.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-81012
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-81012
git.kernel.org
https://git.kernel.org/stable/c/3cc772d0154799961f032e5a992d4a50523e291a
git.kernel.org
https://git.kernel.org/stable/c/8f5aa1506cdddea6b33584c2445b9ce99eeddb64
git.kernel.org
https://git.kernel.org/stable/c/b15b334fbc3c0c46440f8a892ebf62164fca23d6
git.kernel.org
https://git.kernel.org/stable/c/dc03f05e419f3460342fb7564884f244622634b6
git.kernel.org
https://git.kernel.org/stable/c/ddf98cf33529714b3ba1a158afb1db5b0f759a1a
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