CVE-2026-64440

In the Linux kernel, the following vulnerability has been resolved:

staging: rtl8723bs: fix OOB write in HT_caps_handler()

HT_caps_handler() iterates pIE->length bytes and writes into

HT_caps.u.HT_cap[], which is a fixed 26-byte array (sizeof struct

HT_caps_element). Because pIE->length is a raw u8 from an over-the-air

802.11 AssocResponse frame and is never validated, a malicious AP can

set it up to 255, causing up to 229 bytes of out-of-bounds writes into

adjacent fields of struct mlme_ext_info.

Truncate the iteration count to the size of HT_caps.u.HT_cap using

umin() so that data from a longer-than-expected IE is silently ignored

rather than written out of bounds, preserving interoperability with APs

that pad the element. An early return on oversized IEs was considered

but rejected: it would bypass the pmlmeinfo->HT_caps_enable = 1

assignment that precedes the loop, silently disabling HT mode for APs

that append extra bytes to the HT Capabilities IE.