CVE-2026-64445
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk24th percentile - higher than 24% of all known CVEs
Summary
In the rtl8723bs driver in the Linux kernel, an underflow and OOB read occur in OnAuth() when a short authentication frame causes negative length calculation in rtw_wep_decrypt(), leading to out-of-bounds read. Also, memcmp always reads 128 bytes regardless of actual IE length.
Risk Assessment
Out-of-bounds read can lead to information disclosure or system crashes, and a remote attacker can exploit this by sending crafted frames.
Recommendation
Apply the Linux kernel patch that adds minimum length checks before WEP decryption and validates Challenge Text IE length.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix WEP length underflow and OOB read in OnAuth() OnAuth() has two bugs in the shared-key authentication path. When the Privacy bit is set, rtw_wep_decrypt() is called without verifying that the frame is long enough to contain a valid WEP IV and ICV. Inside rtw_wep_decrypt(), length is computed as: length = len - WLAN_HDR_A3_LEN - iv_len and then passed as (length - 4) to crc32_le(). If len is less than WLAN_HDR_A3_LEN + iv_len + icv_len (32 bytes), length - 4 is negative and, after the implicit cast to size_t, causes crc32_le() to read far beyond the frame buffer. Add a minimum length check before accessing the IV field and calling the decryption path. When processing a seq=3 response, rtw_get_ie() stores the Challenge Text IE length in ie_len, but the subsequent memcmp() always reads 128 bytes regardless of ie_len. IEEE 802.11 mandates a challenge text of exactly 128 bytes; reject any IE whose length field differs, matching the check already applied to OnAuthClient().