CVE-2026-81012

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References