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CVE-2026-74581

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: clear suppressed fib6 rule result fib6_rule_suppress() drops a suppressed route with ip6_rt_put_flags(), but leaves…

Published Aug 21, 2026EPSS 0.42%

Overview

CVE-2026-74581 is a critical-severity vulnerability. It was published on August 21, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

net: ipv6: clear suppressed fib6 rule result

fib6_rule_suppress() drops a suppressed route with ip6_rt_put_flags(),

but leaves res->rt6 pointing at the released rt6_info.

If no later rule supplies a replacement, fib6_rule_lookup() still sees

res.rt6 and returns that stale dst to its caller. A suppressing rule can

therefore leak a released route back to rt6_lookup(), and the next put

hits rcuref_put_slowpath() from dst_release().

Clear res->rt6 when suppressing the route so suppressed lookups fall

through to the null dst instead of reusing the released one.

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

Refgit.kernel.org/stable/c/354db6243eca59e9d187ffbf8b7955b044ce84dcRefgit.kernel.org/stable/c/5d29b286c9de0b309e94b9ed083aa1a2f429434fRefgit.kernel.org/stable/c/6aea62e433fe1b586202a5fee8b5807ce635e1d7Refgit.kernel.org/stable/c/6d98c70fe0ba8c7708bfd5b2a5174d2086775daaRefgit.kernel.org/stable/c/90c57310e266eb94e4a80d6b15a9ca131d2e82cbRefgit.kernel.org/stable/c/9bad152c42b37499162367fe47867411e62fffa3Refgit.kernel.org/stable/c/a341c091ca0bfae377747b1b59a3bd8ebe18a937Refgit.kernel.org/stable/c/dc3ab04220667f254f4348572b2a0b3febff89fb

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74581?

CVE-2026-74581 is a critical-severity vulnerability. It was published on August 21, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-74581?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-74581?

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-2026-74581?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74581 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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