CVE-2026-64313

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < d11b2bb99bec1f5557c01cac42231e23745f49b8affected
LinuxLinux3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < b709e0e768766abe29a49e1c1922a1604be602f4affected
LinuxLinux3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < 24a54dfa06d09813b4802a374fad3d2c0e16a884affected
LinuxLinux3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < 677450e5ef850c4d28b7956aa01104548c2a894eaffected
LinuxLinux3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < 5275e0fca256d081e2e7d4ba3dd8216c6e50d44eaffected
LinuxLinux3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < 774ddddf5eb26eeca177350413e3e2bc50930ee9affected
LinuxLinux3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < ebaae7c4251cc0cdb2602f334d4f08a3e82d271eaffected
LinuxLinux3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < 27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406affected
LinuxLinux4.8affected
LinuxLinux0 < 4.8unaffected
LinuxLinux5.10.261 <= 5.10.*unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.96 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References