CVE-2026-64445
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().
CSIRTS triage
- What
- There is a fix for a WEP length underflow and out-of-bounds read in the OnAuth() function.
- Who is affected
- Deployments using the rtl8723bs driver are affected.
- Urgency
- Remediation is necessary to prevent potential exploitation, although exploitation status is currently unknown.
- Action
- Apply the fix for CVE-2026-64445.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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