CVE-2026-90016
HighCVSS 7.1Summary
In the Linux kernel, the staging rtl8723bs driver's rtw_restruct_wmm_ie() scans the in_ie buffer for a WMM IE. When the 'i + 5 < in_len' check fails near the end of the buffer, execution falls through to 'i += (in_ie[i + 1] + 2)', which at i == in_len - 1 causes a 1-byte out-of-bounds read. A previous fix added the guard only to the match condition, not to the advance.
Risk Assessment
An attacker can supply crafted association/scan data, 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 an explicit bounds check before advancing to the next IE.
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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_restruct_wmm_ie() rtw_restruct_wmm_ie() scans in_ie for a WMM IE with: while (i < in_len) { ... if (i + 5 < in_len && in_ie[i] == 0xDD && ...) { ... break; } i += (in_ie[i + 1] + 2); /* to the next IE element */ } When the "i + 5 < in_len" match check fails simply because i is within 5 bytes of the end of the buffer (i.e. no WMM IE was found near the tail of in_ie), execution falls through to "i += (in_ie[i + 1] + 2)", which reads in_ie[i + 1]. If i == in_len - 1 at that point, this is a 1-byte out-of-bounds read of an attacker-influenced IE buffer built from association/scan data. Commit a75281626fc8f ("staging: rtl8723bs: fix potential out-of-bounds read in rtw_restruct_wmm_ie") added the "i + 5 < in_len" guard to the match condition itself, but did not add an equivalent guard before the fallthrough advance, so the same class of OOB read remained reachable through the non-matching path. Add an explicit bounds check before advancing to the next IE.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS