CVE-2026-74581
Linux kernel vulnerability
- Published21 Aug 2026
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.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HRemediation
No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.
References
- https://git.kernel.org/stable/c/354db6243eca59e9d187ffbf8b7955b044ce84dc
- https://git.kernel.org/stable/c/5d29b286c9de0b309e94b9ed083aa1a2f429434f
- https://git.kernel.org/stable/c/6aea62e433fe1b586202a5fee8b5807ce635e1d7
- https://git.kernel.org/stable/c/6d98c70fe0ba8c7708bfd5b2a5174d2086775daa
- https://git.kernel.org/stable/c/90c57310e266eb94e4a80d6b15a9ca131d2e82cb
- https://git.kernel.org/stable/c/9bad152c42b37499162367fe47867411e62fffa3
- https://git.kernel.org/stable/c/a341c091ca0bfae377747b1b59a3bd8ebe18a937
- https://git.kernel.org/stable/c/dc3ab04220667f254f4348572b2a0b3febff89fb
Frequently asked
Is CVE-2026-74581 being actively exploited?
CVE-2026-74581 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.42%.
How severe is CVE-2026-74581?
CVE-2026-74581 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.42% probability of exploitation.
How do I fix CVE-2026-74581?
Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2026-74581 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.