CVE-2026-90016staging: rtl8723bs: fix OOB read in rtw_restruct_wmm_ie()

Official description

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/0c1f8bada613edbd810d010996d36159092576d5
• https://git.kernel.org/stable/c/55034fa38bd8b302ceb32c15e8a98298f56f629b
• https://git.kernel.org/stable/c/a8d76480d1abbbf617c2d6d9f60bf95ab45cff04
• https://git.kernel.org/stable/c/716850842d2f103f915fe7c857ff1a0a036491b4
• https://git.kernel.org/stable/c/e63b72c5d7336981dfc05e5cb92becff29dfea00
• https://git.kernel.org/stable/c/4420cc71841b50e31a7868ef7acb011c0e08d294
• https://git.kernel.org/stable/c/fd19b8895f8a91087e8a62f1e27b128025dabb95
• https://git.kernel.org/stable/c/28a289beaf226b30b1e6e7d7b1a2946fe2d6e852