CVE-2026-64446

Technical Description

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

staging: rtl8723bs: fix heap buffer overflow in rtw_cfg80211_set_wpa_ie()

supplicant_ie is a 256-byte array in struct security_priv. The WPA and

WPA2 IE copy paths use:

memcpy(padapter->securitypriv.supplicant_ie, &pwpa[0], wpa_ielen + 2);

where wpa_ielen is the raw IE length field (u8, 0-255). When a local user

supplies a connect request via nl80211 with a crafted WPA IE of length 255,

wpa_ielen + 2 equals 257, overflowing the 256-byte buffer by one byte into

the adjacent last_mic_err_time field.

rtw_parse_wpa_ie() does not prevent this: its length consistency check

compares *(wpa_ie+1) against (u8)(wpa_ie_len-2), which is (u8)(255) == 255

when wpa_ie_len = 257, so the check passes silently.

Add explicit bounds checks for both the WPA and WPA2 paths before the

memcpy, rejecting any IE whose total size (wpa_ielen + 2) exceeds the

supplicant_ie buffer.

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