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CVE-2026-64313

crypto: ecc - Fix carry overflow in vli multiplication

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 · fixed in d11b2bb99bec1f5557c01cac42231e23745f49b8; From 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 · fixed in b709e0e768766abe29a49e1c1922a1604be602f4; From 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 · fixed in 24a54dfa06d09813b4802a374fad3d2c0e16a884; From 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 · fixed in 677450e5ef850c4d28b7956aa01104548c2a894e; From 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 · fixed in 5275e0fca256d081e2e7d4ba3dd8216c6e50d44e; From 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 · fixed in 774ddddf5eb26eeca177350413e3e2bc50930ee9; From 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 · fixed in ebaae7c4251cc0cdb2602f334d4f08a3e82d271e; From 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 · fixed in 27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406

  • Linux Linux

    4.8

  • KernelLinux

    From 4.8.0 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.96; From 6.13.0 · fixed in 6.18.39; From 6.19.0 · fixed in 7.1.4

References 8

git.kernel.org