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CVE-2025-21728

Description

In the Linux kernel, the following vulnerability has been resolved:bpf: Send signals asynchronously if !preemptibleBPF programs can execute in all kinds of contexts and when a programrunning in a non-preemptible context uses the bpf_send_signal() kfunc,it will cause issues because this kfunc can sleep.Change `irqs_disabled()` to `!preemptible()`.

POC

Reference

No PoCs from references.

Github

- https://github.com/w4zu/Debian_security