platform/x86: hp-bioscfg: fix off-by-one write in hp_get_string_from_buffer()

Summary

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.

Timeline

1. Sep 11, 2026, 7:43 PM UTCCVE published
2. Oct 19, 2026, 8:46 AM UTCRecord last updated

Affected versions

• Linux Linux

  From a34fc329b1895fc8a6eb12099adc47009421ba6a · fixed in 8f5aa1506cdddea6b33584c2445b9ce99eeddb64; From a34fc329b1895fc8a6eb12099adc47009421ba6a · fixed in 3cc772d0154799961f032e5a992d4a50523e291a; From a34fc329b1895fc8a6eb12099adc47009421ba6a · fixed in b15b334fbc3c0c46440f8a892ebf62164fca23d6; From a34fc329b1895fc8a6eb12099adc47009421ba6a · fixed in ddf98cf33529714b3ba1a158afb1db5b0f759a1a; From a34fc329b1895fc8a6eb12099adc47009421ba6a · fixed in dc03f05e419f3460342fb7564884f244622634b6

• Linux Linux

  6.6

• KernelLinux

  From 6.6.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4

References 5