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()`.

Classification

CVE ID: CVE-2025-21728

Affected Products

Vendor: Linux, Linux

Product: Linux, Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 10.65% (scored less or equal to compared to others)

EPSS Date: 2025-03-27 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-21728
https://git.kernel.org/stable/c/be42a09fe898635b0093c0c8dac1bfabe225c240
https://git.kernel.org/stable/c/eeef8e65041a031bd8a747a392c14b76a123a12c
https://git.kernel.org/stable/c/78b97783496b454435639937db3303e900a24d3f
https://git.kernel.org/stable/c/092fc76b7ab4163e008f9cde596a58dad2108260
https://git.kernel.org/stable/c/87c544108b612512b254c8f79aa5c0a8546e2cc4

Timeline