Linux Kernel up to 7.1.3 ECC crypto/ecc.c mul_64_64 integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k3.18-

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.1.3. It has been rated as very critical. The affected element is the function mul_64_64 of the file crypto/ecc.c of the component ECC. Performing a manipulation results in integer overflow. This vulnerability was named CVE-2026-64313. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.1.3. This affects the function mul_64_64 of the file crypto/ecc.c of the component ECC. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. 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: ecc - Fix carry overflow in vli multiplication The carry flag calculation fails when r01.m_high is saturated (0xFFFFFFFFFFFFFFFF) and addition of lower bits overflows. The condition (r01.m_high < product.m_high) doesn't handle the case where r01.m_high == product.m_high and an additional carry exists from lower-bit overflow. When commit 3c4b23901a0c ("crypto: ecdh - Add ECDH software support") introduced crypto/ecc.c, it split the muladd() function in the micro-ecc library into separate mul_64_64() and add_128_128() helpers. It seems the check got lost in translation. Add proper handling for this boundary by accounting for the carry from the lower addition.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-64313 since 07/19/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing 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 d11b2bb99bec1f5557c01cac42231e23745f49b8/b709e0e768766abe29a49e1c1922a1604be602f4/24a54dfa06d09813b4802a374fad3d2c0e16a884/677450e5ef850c4d28b7956aa01104548c2a894e/5275e0fca256d081e2e7d4ba3dd8216c6e50d44e/774ddddf5eb26eeca177350413e3e2bc50930ee9/ebaae7c4251cc0cdb2602f334d4f08a3e82d271e/27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406 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: Integer overflow
CWE: CWE-190 / CWE-189
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: d11b2bb99bec1f5557c01cac42231e23745f49b8/b709e0e768766abe29a49e1c1922a1604be602f4/24a54dfa06d09813b4802a374fad3d2c0e16a884/677450e5ef850c4d28b7956aa01104548c2a894e/5275e0fca256d081e2e7d4ba3dd8216c6e50d44e/774ddddf5eb26eeca177350413e3e2bc50930ee9/ebaae7c4251cc0cdb2602f334d4f08a3e82d271e/27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406

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-2026-64313 (🔒)
GCVE (CVE): GCVE-0-2026-64313
GCVE (VulDB): GCVE-100-383103

Entryinfo

Created: 07/25/2026 14:43
Changes: 07/25/2026 14:43 (60)
Complete: 🔍
Cache ID: 216::103

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