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Vulnerability record · CVE-2026-64304 · published 25 July 2026

CVE-2026-64304: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.5% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
3 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/1002719d13072a5e4be1e993aa61dffb4a604e82 Patch
https://git.kernel.org/stable/c/3d61a214fdcda41f1ebfabbb483404032a7b4d91 Patch
https://git.kernel.org/stable/c/500319830d76911c120dc0b9605f8c16d7702844 Patch
https://git.kernel.org/stable/c/6d99c5fadd2df488103f64d6475b63ba6852202b Patch
https://git.kernel.org/stable/c/6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a Patch
https://git.kernel.org/stable/c/b3ac78756588059729b9195fcc9f4b37d54057a5 Patch
https://git.kernel.org/stable/c/c34369473bfe92a0b46ec78d6358e30341c7f481 Patch
https://git.kernel.org/stable/c/ce42224487c504aee4b7ff3a7342e7b4d7e28cc9 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64304), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.