kernelCTF: add CVE-2026-23273_cos

[4ab48b3f1ded2472]

No description provided.

[matrizzo]

It looks like vuln-verify is failing because there is no objcopy in the repro environment, we can see if it can be added. In the meantime can you take a look at why the repro on COS is failing? It looks like the exploit is hanging the kernel

[4ab48b3f1ded2472]

It looks like vuln-verify is failing because there is no objcopy in the repro environment, we can see if it can be added.

That's strange, objcopy is present in both v2 and v3 rootfs images.
Currently vuln-verify doesn't even run the exploit, so there are more issues with it.

In the meantime can you take a look at why the repro on COS is failing? It looks like the exploit is hanging the kernel

I made some changes to improve reliability.

[artmetla]

Please have one more look at kernelXDK usage and fix or comment on it.

[koczkatamas]

Hey! vuln-verify fails here, it prints out a lot of "delays: 29 14 try: 0" lines and then it times out. Do you think you could implement --vuln-trigger to make it pass?

See this run: https://github.com/google/security-research/actions/runs/28395286404
Logs: https://github.com/google/security-research/actions/runs/28395286404/artifacts/7961794936