wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-68373 · Microsoft / collected KEV context

cve-program · CVE-2026-68373

• https://git.kernel.org/stable/c/cb831aff2f850f72bc5ff5ad77d0a70bb5a84061
• https://git.kernel.org/stable/c/4875680d1703f56afa6257ba30244f2fb44ed205
• https://git.kernel.org/stable/c/b406f33d234f98c8b310fdab5cbb492d85e98e49
• https://git.kernel.org/stable/c/e165a1d295e7e814e13b0f92c86e5d48309509ce
• https://git.kernel.org/stable/c/bcde7249d45f52f994a9872bedf45994472ade77
• https://git.kernel.org/stable/c/fb1b50ab699211e777dca5ccfb648788b6a6e519
• https://git.kernel.org/stable/c/f742d9c98b5c504fc9e6744eef13a721c2aea486
• https://git.kernel.org/stable/c/61a799ffd1e5a4fd3702d547828b7ff3d161468e

No related operational record is retained in the current change model.