CVE-2026-64440

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

staging: rtl8723bs: fix OOB write in HTcapshandler()

HTcapshandler() iterates pIE->length bytes and writes into HTcaps.u.HTcap[], which is a fixed 26-byte array (sizeof struct HTcapselement). 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 mlmeextinfo.

Truncate the iteration count to the size of HTcaps.u.HTcap 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->HTcapsenable = 1 assignment that precedes the loop, silently disabling HT mode for APs that append extra bytes to the HT Capabilities IE.