CVE-2026-81012
HighCVSS 8.4Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, the platform/x86 hp-bioscfg driver's hp_get_string_from_buffer() clamped the converted string length against the destination buffer size using "size > dst_size". When the length equaled dst_size, the unconditional NUL terminator write landed one byte past the destination buffer.
Risk Assessment
An off-by-one write past the buffer can corrupt adjacent kernel memory and lead to instability or potential privilege escalation.
Recommendation
Update the Linux kernel to a version containing the fix that changes the comparison to ">=" so room for the NUL terminator is always left.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS