In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK fi…
CVE-2026-74704 · published 22 Aug 2026
How serious is it
- Severity: high, CVSS score 8.2 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-2026-74704?
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: 4.19
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/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter
The sch_cake ACK filter parses packets to find the TCP header and filter
duplicated ACKs if the flow is backlogged. The parsing code contains a
WARN_ON(1) which can be triggered by a malformed IP header in certain
cases. Depending on the system configuration, this leads either to
either spamming dmesg with warnings, or a panic if panic_on_warn is set.
The code already correctly skips the offending packet in the branch that
triggers the warning, so the WARN_ON itself doesn't really serve any
purpose. So just drop it altogether to avoid the inconvenient side
effects.
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/0c4882bff34558d8d53fb04c3e96da5c327c7dc8
- git.kernel.org/stable/c/2504a76e5c0694e14e15562730e1339f2d9f9458
- git.kernel.org/stable/c/2a33516f9ef59ad11844d4fc152f889449b5daf3
- git.kernel.org/stable/c/a1ae353d8355407c1bea971d1c1af5e7f242bb7d
- git.kernel.org/stable/c/a4b52612004a5639c4bfc30ba93ba414b8326e2a
- git.kernel.org/stable/c/ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3
- git.kernel.org/stable/c/c1693b7844a6c06d31a565e5a494948034dfd235
- git.kernel.org/stable/c/cd2f1d9fe8a507c2dc86ad326fe221f121c47734
Merged from NVD. Last updated 24 Oct 2026. All vulnerabilities · RSS · JSON