CVE-2025-21728 Information

Description

In the Linux kernel the following vulnerability has been resolved:

bpf: Send signals asynchronously if !preemptible

BPF programs can execute in all kinds of contexts and when a program running 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().

Reference

https://git.kernel.org/stable/c/092fc76b7ab4163e008f9cde596a58dad2108260 https://git.kernel.org/stable/c/78b97783496b454435639937db3303e900a24d3f https://git.kernel.org/stable/c/87c544108b612512b254c8f79aa5c0a8546e2cc4 https://git.kernel.org/stable/c/be42a09fe898635b0093c0c8dac1bfabe225c240 https://git.kernel.org/stable/c/eeef8e65041a031bd8a747a392c14b76a123a12c