In the Linux kernel, the following vulnerability has been resolved: net: ipv6: clear suppressed fib6 rule result fib6_rule_suppress() d…
CVE-2026-74581 · published 21 Aug 2026
How serious is it
- Severity: critical, CVSS score 9.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-74581?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 5.16
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/354db6243eca59e9d187ffbf8b7955b044ce84dc
- git.kernel.org/stable/c/5d29b286c9de0b309e94b9ed083aa1a2f429434f
- git.kernel.org/stable/c/6aea62e433fe1b586202a5fee8b5807ce635e1d7
- git.kernel.org/stable/c/6d98c70fe0ba8c7708bfd5b2a5174d2086775daa
- git.kernel.org/stable/c/90c57310e266eb94e4a80d6b15a9ca131d2e82cb
- git.kernel.org/stable/c/9bad152c42b37499162367fe47867411e62fffa3
- git.kernel.org/stable/c/a341c091ca0bfae377747b1b59a3bd8ebe18a937
- git.kernel.org/stable/c/dc3ab04220667f254f4348572b2a0b3febff89fb
Merged from NVD. Last updated 24 Oct 2026. All vulnerabilities · RSS · JSON