PT-2026-64534 · Linux · Linux

CVE-2026-64313 · Published 2026-07-25 · Updated 2026-07-25

NVD

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.

Related Identifiers

CVE-2026-64313

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-64313 · Security Note
• https://git.kernel.org/stable/c/b709e0e768766abe29a49e1c1922a1604be602f4 · Note
• https://git.kernel.org/stable/c/5275e0fca256d081e2e7d4ba3dd8216c6e50d44e · Note
• https://git.kernel.org/stable/c/677450e5ef850c4d28b7956aa01104548c2a894e · Note
• https://git.kernel.org/stable/c/27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406 · Note
• https://git.kernel.org/stable/c/ebaae7c4251cc0cdb2602f334d4f08a3e82d271e · Note
• https://git.kernel.org/stable/c/24a54dfa06d09813b4802a374fad3d2c0e16a884 · Note
• https://git.kernel.org/stable/c/774ddddf5eb26eeca177350413e3e2bc50930ee9 · Note
• https://git.kernel.org/stable/c/d11b2bb99bec1f5557c01cac42231e23745f49b8 · Note