CVE-2026-90017
HighCVSS 7.1Summary
In the Linux kernel, the staging rtl8723bs driver's rtw_action_frame_parse() does not check the frame_len parameter before indexing into the frame body. Reading frame_body[0] and frame_body[1] requires frame_len >= 26, so a shorter frame (e.g. 24 bytes) causes a 1-2 byte out-of-bounds read. This is reachable from rtw_cfg80211_monitor_if_xmit_entry() and cfg80211_rtw_mgmt_tx().
Risk Assessment
An attacker within network range can send a short management frame, triggering an out-of-bounds buffer read that may lead to a kernel crash or information leak.
Recommendation
Update the Linux kernel to a version with the fix that adds the missing length check before dereferencing frame_body.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS