CVE-2026-64445: Linux Vulnerability (CVSS 8.8)

Description

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().

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.32%

24.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 665e1ecb68b4e8419604e70a33f02d1c8b0222c6; >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 87cccc2a767f17dcab71e3b9fe5ae29b5516c5ce; >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < c9000c93078e5c0a5a651b077c0ec92a4bc7d580; >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 1f6c9d255bdda41216b6e34c96aa2b1abee0bb84; >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 3e44a7665f3abd320a80d9c64ee4a93317041b8b; >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 64ec4192d9c10e96922245d4a6747304cc76b19d; >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < d90b9f39f375c9826ef145605dfe97765d0ecb91; >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < a1fc19d61f661d47204f095b593de507884849f7
Linux	Linux	4.12

References

Timeline

Published: Jul 25, 2026
Last Modified: Aug 11, 2026
Status: Awaiting Analysis

Frequently Asked Questions

What is 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().

How severe is CVE-2026-64445?

CVE-2026-64445 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.

How do I fix CVE-2026-64445?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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