Skip to main content

Over 150 LLM Providers · Over 5,300 Models The most extensible AI-powered pentesting platform. Open source. Star on GitHub

CVE-2026-74657

Published Aug 22, 2026 EPSS 0.18% (7th pctl)

Overview

CVE-2026-74657 is a known-severity vulnerability. It was published on August 22, 2026.

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

ipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops

fib_nlmsg_size() still estimates nexthop space as if every gateway is

encoded as an IPv4 RTA_GATEWAY attribute. IPv4 routes can also carry an

IPv6 gateway, which fib_nexthop_info() dumps as RTA_VIA.

As a result, route notifications can allocate an skb that is too small.

fib_dump_info() then fails with -EMSGSIZE and rtmsg_fib() hits the

WARN_ON() that marks such failures as a fib_nlmsg_size() bug. With

panic_on_warn set, this becomes a kernel panic.

Mirror the actual nexthop dump layout in fib_nlmsg_size(): account for

IPv6 nexthop gateways dumped as RTA_VIA, for the no-header rtnexthop

layout used inside RTA_MULTIPATH, and for RTA_FLOW only when it is

actually present.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Ref git.kernel.org/stable/c/0f0ca602941d0a81ae9514943ca06c55159c6385 Ref git.kernel.org/stable/c/4a5dfbae5179f6574695012a980476254df2d295 Ref git.kernel.org/stable/c/4ff9548d84945d2cbf9e4c207288063a200ea397 Ref git.kernel.org/stable/c/5307a53599fa762c06e475ee4a375252074fd324 Ref git.kernel.org/stable/c/57195f0ab5cfbb5ee0864e5aff15ceb48f5a5e28 Ref git.kernel.org/stable/c/7f80ad373ce4a7af5367ff273cea0f16e91387f3 Ref git.kernel.org/stable/c/9b22f13524fa0de0d963bbd3002df6c28bae3395 Ref git.kernel.org/stable/c/a59edda6eda1252340354322d8ab318b2e9052fb

Frequently Asked Questions

What is CVE-2026-74657?

CVE-2026-74657 is a known-severity vulnerability. It was published on August 22, 2026.

How severe is CVE-2026-74657?

CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.

How do I fix or remediate CVE-2026-74657?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-74657?

CyberStrike's AI-powered security agents can automatically detect CVE-2026-74657 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

Autonomous Discovery

AI agents map your attack surface to find vulnerabilities like this one.
Continuous Pentesting

Automated penetration testing that runs continuously, not just quarterly.
Code Review

AI-driven PR review catches vulnerable dependencies before they ship.
HackBrowser

Browser-based exploitation validates findings with real proof-of-concept.
Browse by year 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999