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CVE-2026-64304

HIGHCVSS 7.8/10EPSS 0.16%

Last modified

CVE-2026-64304 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.8/10

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

EPSS Probability
0.16%

6.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 879f77e9071f029e1c9bd5a75814ecf51370f846, < 6d99c5fadd2df488103f64d6475b63ba6852202b; >= 879f77e9071f029e1c9bd5a75814ecf51370f846, < c34369473bfe92a0b46ec78d6358e30341c7f481; >= 879f77e9071f029e1c9bd5a75814ecf51370f846, < 1002719d13072a5e4be1e993aa61dffb4a604e82; >= 879f77e9071f029e1c9bd5a75814ecf51370f846, < 500319830d76911c120dc0b9605f8c16d7702844; >= 879f77e9071f029e1c9bd5a75814ecf51370f846, < 3d61a214fdcda41f1ebfabbb483404032a7b4d91; >= 879f77e9071f029e1c9bd5a75814ecf51370f846, < 6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a; >= 879f77e9071f029e1c9bd5a75814ecf51370f846, < ce42224487c504aee4b7ff3a7342e7b4d7e28cc9; >= 879f77e9071f029e1c9bd5a75814ecf51370f846, < b3ac78756588059729b9195fcc9f4b37d54057a5
LinuxLinux4.8

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is 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 (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.
How severe is CVE-2026-64304?
CVE-2026-64304 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64304?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST