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CVE-2026-64313: In the Linux kernel, the following vulnerability has been resolved: crypto: ecc - Fix carry overflow in vli m

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HIGH 8.8WATCHLISTUPGRADE

CVE-2026-64313 is a high-severity flaw (CVSS 8.8) affecting linux kernel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 - A

Why this priority

  • High severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score8.8 (High)
Attack vectorAdjacent network
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.4% (top 72%)
CISA exploited listNo
WeaknessCWE-190
Published2026-07-25
Last modified2026-10-24
Publisher (CNA): kernel.org · Vendor: linux

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

linux linux kernel UPGRADE
Affected: >= 4.8 and < 5.10.261 · >= 5.11 and < 5.15.212 · >= 5.16 and < 6.1.178 · >= 6.2 and < 6.6.145 · >= 6.7 and < 6.12.96 · >= 6.13 and < 6.18.39 · >= 6.19 and < 7.1.4
Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source
sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321
Ubuntu 22.04 · linux · FIXED · 5.15.0-198.208
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "5.15.0-198.208" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 24.04 · linux · FIXED · 6.8.0-147.147
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.8.0-147.147" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 20.04 · linux-hwe-5.15 · FIXED · 5.15.0-198.208~20.04.1
sudo apt update && sudo apt install --only-upgrade linux-hwe-5.15 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux-hwe-5.15)" ge "5.15.0-198.208~20.04.1" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 22.04 · linux-hwe-6.8 · NO FIX YET
Ubuntu 24.04 · linux-hwe-6.17 · NO FIX YET
Debian 12 · linux · FIXED · 6.1.180-1
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.1.180-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · linux · FIXED · 6.12.96-1
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.12.96-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · linux-6.12 · FIXED · 6.12.100-1~deb12u1
sudo apt update && sudo apt install --only-upgrade linux-6.12 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux-6.12)" ge "6.12.100-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · kernel · DEFERRED
RHEL 6 · kernel · NOT AFFECTED
RHEL 7 · kernel · NOT AFFECTED
RHEL 7 · kernel-rt · NOT AFFECTED
RHEL 8 · kernel · DEFERRED
Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-2058 · source
sudo dnf update --advisory=ALAS2023-2026-2058
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-64313?

linux kernel: upgrade to 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4. Exact commands for each OS are on this page.

Is CVE-2026-64313 being exploited?

CVE-2026-64313 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-64313 affect?

CVE-2026-64313 affects linux kernel. Severity is high (CVSS 8.8). 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 overf

How urgent is CVE-2026-64313?

Priority 43/100. High severity; On your watchlist

Software pages

Linux kernel vulnerabilities

Related CVEs

References

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