Linux Kernel up to 7.1.3 QAT rsa_helper.c qat_rsa_setkey_crt buffer overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$5k-$25k2.32-

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 7.1.3. Affected by this vulnerability is the function qat_rsa_setkey_crt of the file rsa_helper.c of the component QAT. Performing a manipulation results in buffer overflow. This vulnerability is reported as CVE-2026-64304. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 7.1.3. This affects the function qat_rsa_setkey_crt of the file rsa_helper.c of the component QAT. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-64304 since 07/19/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/25/2026).

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4 or 7.2-rc1 eliminates this vulnerability. Applying the patch 6d99c5fadd2df488103f64d6475b63ba6852202b/c34369473bfe92a0b46ec78d6358e30341c7f481/1002719d13072a5e4be1e993aa61dffb4a604e82/500319830d76911c120dc0b9605f8c16d7702844/3d61a214fdcda41f1ebfabbb483404032a7b4d91/6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a/ce42224487c504aee4b7ff3a7342e7b4d7e28cc9/b3ac78756588059729b9195fcc9f4b37d54057a5 is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.261/5.15.212/6.1.178/6.6.145/6.12.96/6.18.39/7.1.4/7.2-rc1
Patch: 6d99c5fadd2df488103f64d6475b63ba6852202b/c34369473bfe92a0b46ec78d6358e30341c7f481/1002719d13072a5e4be1e993aa61dffb4a604e82/500319830d76911c120dc0b9605f8c16d7702844/3d61a214fdcda41f1ebfabbb483404032a7b4d91/6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a/ce42224487c504aee4b7ff3a7342e7b4d7e28cc9/b3ac78756588059729b9195fcc9f4b37d54057a5

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64304 (🔒)
GCVE (CVE): GCVE-0-2026-64304
GCVE (VulDB): GCVE-100-383097

Entryinfo

Created: 07/25/2026 14:19
Changes: 07/25/2026 14:19 (60)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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