CVE-2026-64304
Published: July 29, 2026Last modified: July 29, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Vulnerable (6.1.177-r0) |
| 25 LTS | linux-lts | Vulnerable (6.12.95-r0) | |
| Stream | linux-lts | Vulnerable (6.18.38-r0) |
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
- https://git.kernel.org/stable/c/b3ac78756588059729b9195fcc9f4b37d54057a5
- https://git.kernel.org/stable/c/c34369473bfe92a0b46ec78d6358e30341c7f481
- https://git.kernel.org/stable/c/ce42224487c504aee4b7ff3a7342e7b4d7e28cc9