CVE-2026-64304

In the Linux kernel, the following vulnerability has been resolved:

crypto: qat - validate RSA CRT component lengths

The generic RSA key parser (rsahelper.c) bounds each CRT component (p, q, dp, dq, qinv) by the modulus size nsz, but qatrsasetkeycrt() allocates half-size DMA buffers (keysz / 2) and right-aligns each component with:

memcpy(dst + half_key_sz - len, src, len)

When a CRT component is larger than halfkeysz the subtraction underflows and memcpy writes past the DMA buffer, causing memory corruption.

Add a len > halfkeysz check next to the existing !len check for each of the five CRT components so the driver falls back to the non-CRT path instead of writing out of bounds.