CVE-2026-64313 crypto: ecc - Fix carry overflow in vli multiplication
An integer overflow in Linux kernel ECC multiplication causes incorrect cryptographic results, potentially compromising data integrity or security.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64313?
CVE-2026-64313 is a high-severity vulnerability in Linux kernel, published on 25 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-190
Which versions are affected by CVE-2026-64313?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64313?
Apply the vendor's patch.
Is CVE-2026-64313 being exploited?
There is no known exploitation of CVE-2026-64313 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-93653, BELL-CVE-2026-64313, DEBIAN-CVE-2026-64313, GHSA-x49g-5fpg-2qxf, ROOT-OS-DEBIAN-12-CVE-2026-64313, ROOT-OS-UBUNTU-2204-CVE-2026-64313 and 1 more.