CVE-2025-21728

bpf: Send signals asynchronously if !preemptible

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()`.

N/A

CVSS

Severity:

EPSS 0.07%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/feba1308bc5e8e04cee751d39fae8a9b407a9034
https://git.kernel.org/stable/c/ce51eab2070e295d298f42a2f1db269cd1b56d55
https://git.kernel.org/stable/c/e306eaaa3d78b462db5f5b11e0171f9d2b6ca3f4
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

Frequently Asked Questions

What is the severity of CVE-2025-21728?: CVE-2025-21728 has not yet been assigned a CVSS score.
How to fix CVE-2025-21728?: To fix CVE-2025-21728, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21728 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-21728 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21728?: CVE-2025-21728 affects Linux Linux, Linux Linux.

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