CVE-2026-64304 crypto: qat - validate RSA CRT component lengths
A buffer overflow in the Linux kernel QAT driver allows attackers to corrupt memory and potentially execute code or escalate privileges via crafted RSA keys.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64304?
CVE-2026-64304 is a high-severity memory corruption vulnerability in Linux kernel, published on 25 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-787
Which versions are affected by CVE-2026-64304?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64304?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-64304 being exploited?
There is no known exploitation of CVE-2026-64304 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-64304, DEBIAN-CVE-2026-64304, GHSA-63x3-xxqc-x6vr, ROOT-OS-DEBIAN-12-CVE-2026-64304, ROOT-OS-UBUNTU-2204-CVE-2026-64304, UBUNTU-CVE-2026-64304.