CVE-2026-90017 is a vulnerability in Linux Kernel
Published on September 16, 2026
staging: rtl8723bs: fix OOB read in rtw_action_frame_parse()
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.
Products Associated with CVE-2026-90017
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Affected Versions
Linux:- Version 554c0a3abf216c991c5ebddcdb2c08689ecd290b and below 15081ff835b29e456da29303b32efc436df04695 is affected.
- Version 554c0a3abf216c991c5ebddcdb2c08689ecd290b and below 310aaa8058d19cc431aedac0f5bb814e84479393 is affected.
- Version 554c0a3abf216c991c5ebddcdb2c08689ecd290b and below 1410bce22351ba15d8e58287cbf09d55d7f21fc9 is affected.
- Version 554c0a3abf216c991c5ebddcdb2c08689ecd290b and below 0b7f64c7bb9664777168768c6b44affb07dcbf24 is affected.
- Version 554c0a3abf216c991c5ebddcdb2c08689ecd290b and below 136f9a3ab87ded8aaf081425cfb2059659dd9023 is affected.
- Version 554c0a3abf216c991c5ebddcdb2c08689ecd290b and below b041e3f35e0d262d42a711094ab594634d72744a is affected.
- Version 554c0a3abf216c991c5ebddcdb2c08689ecd290b and below a54fd1a44862d263df9f8bc17fca3620be31addb is affected.
- Version 554c0a3abf216c991c5ebddcdb2c08689ecd290b and below ff917923f4fb9c83717ba135ee47d7e4c1567bb7 is affected.
- Version 4.12 is affected.
- Before 4.12 is unaffected.
- Version 5.10.270, <= 5.10.* is unaffected.
- Version 5.15.221, <= 5.15.* is unaffected.
- Version 6.1.188, <= 6.1.* is unaffected.
- Version 6.6.157, <= 6.6.* is unaffected.
- Version 6.12.110, <= 6.12.* is unaffected.
- Version 6.18.51, <= 6.18.* is unaffected.
- Version 7.2.5, <= 7.2.* is unaffected.
- Version 7.3-rc2, <= * is unaffected.