CVE-2026-64313crypto: ecc - Fix carry overflow in vli multiplication
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 before d11b2bb99bec1f5557c01cac42231e23745f49b8; from 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 before b709e0e768766abe29a49e1c1922a1604be602f4; from 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 before 24a54dfa06d09813b4802a374fad3d2c0e16a884; from 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 before 677450e5ef850c4d28b7956aa01104548c2a894e; from 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 before 5275e0fca256d081e2e7d4ba3dd8216c6e50d44e; from 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 before 774ddddf5eb26eeca177350413e3e2bc50930ee9; from 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 before ebaae7c4251cc0cdb2602f334d4f08a3e82d271e; from 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 before 27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.8 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4 | NVD |
References
- https://git.kernel.org/stable/c/d11b2bb99bec1f5557c01cac42231e23745f49b8patch
- https://git.kernel.org/stable/c/b709e0e768766abe29a49e1c1922a1604be602f4patch
- https://git.kernel.org/stable/c/24a54dfa06d09813b4802a374fad3d2c0e16a884patch
- https://git.kernel.org/stable/c/677450e5ef850c4d28b7956aa01104548c2a894epatch
- https://git.kernel.org/stable/c/5275e0fca256d081e2e7d4ba3dd8216c6e50d44epatch
- https://git.kernel.org/stable/c/774ddddf5eb26eeca177350413e3e2bc50930ee9patch
- https://git.kernel.org/stable/c/ebaae7c4251cc0cdb2602f334d4f08a3e82d271epatch
- https://git.kernel.org/stable/c/27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.