CVE-2026-64313

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Source
https://cve.org/CVERecord?id=CVE-2026-64313
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64313.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-64313
Downstream
Published
2026-07-25T08:49:44.546Z
Modified
2026-07-28T04:03:03.977876785Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
crypto: ecc - Fix carry overflow in vli multiplication
Details

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.mhigh < product.mhigh) doesn't handle the case where r01.mhigh == product.mhigh 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 mul6464() and add128128() helpers. It seems the check got lost in translation.

Add proper handling for this boundary by accounting for the carry from the lower addition.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64313.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
3c4b23901a0c766879dff680cd6bdab47bcdbbd2
Fixed
d11b2bb99bec1f5557c01cac42231e23745f49b8
Fixed
b709e0e768766abe29a49e1c1922a1604be602f4
Fixed
24a54dfa06d09813b4802a374fad3d2c0e16a884
Fixed
677450e5ef850c4d28b7956aa01104548c2a894e
Fixed
5275e0fca256d081e2e7d4ba3dd8216c6e50d44e
Fixed
774ddddf5eb26eeca177350413e3e2bc50930ee9
Fixed
ebaae7c4251cc0cdb2602f334d4f08a3e82d271e
Fixed
27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64313.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.8.0
Fixed
5.10.261
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.212
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.178
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.145
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.96
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.39
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.1.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64313.json"