CVE-2026-64304

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: qat - validate RSA CRT component lengths The generic RSA key parser (rsa_helper.c) bounds each CRT component (p, q, dp, dq, qinv) by the modulus size n_sz, but qat_rsa_setkey_crt() allocates half-size DMA buffers (key_sz / 2) and right-aligns each component with: memcpy(dst + half_key_sz - len, src, len) When a CRT component is larger than half_key_sz the subtraction underflows and memcpy writes past the DMA buffer, causing memory corruption. Add a len > half_key_sz 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.

References

• https://git.kernel.org/stable/c/1002719d13072a5e4be1e993aa61dffb4a604e82
• https://git.kernel.org/stable/c/3d61a214fdcda41f1ebfabbb483404032a7b4d91
• https://git.kernel.org/stable/c/500319830d76911c120dc0b9605f8c16d7702844
• https://git.kernel.org/stable/c/6d99c5fadd2df488103f64d6475b63ba6852202b
• https://git.kernel.org/stable/c/6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a