Riskcovery

CVE-2026-64313

crypto: ecc - Fix carry overflow in vli multiplication

State
Published
Severity
8.8 High
Published
Jul 25, 2026
Updated
Oct 19, 2026
Reserved
Jul 19, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.18.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

  • CWE-190 Integer Overflow or Wraparound

Affected Products

ProductVersions
LinuxLinux
  • 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 to before d11b2bb99bec1f5557c01cac42231e23745f49b8Affected
  • 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 to before b709e0e768766abe29a49e1c1922a1604be602f4Affected
  • 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 to before 24a54dfa06d09813b4802a374fad3d2c0e16a884Affected
  • 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 to before 677450e5ef850c4d28b7956aa01104548c2a894eAffected
  • 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 to before 5275e0fca256d081e2e7d4ba3dd8216c6e50d44eAffected
  • 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 to before 774ddddf5eb26eeca177350413e3e2bc50930ee9Affected
  • 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 to before ebaae7c4251cc0cdb2602f334d4f08a3e82d271eAffected
  • 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 to before 27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406Affected
LinuxLinux
  • 4.8Affected
  • before 4.8Not affected
  • 5.10.261 through 5.10.*Not affected
  • 5.15.212 through 5.15.*Not affected
  • 6.1.178 through 6.1.*Not affected
  • 6.6.145 through 6.6.*Not affected
  • 6.12.96 through 6.12.*Not affected
  • 6.18.39 through 6.18.*Not affected
  • 7.1.4 through 7.1.*Not affected
  • 7.2 and laterNot affected

References

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