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CVE-2025-21728 – Linux Kernel BPF Signal Injection Privilege Escalation Vulnerability

The following table lists the changes that have been made to the
CVE-2025-21728 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Feb. 27, 2025

    Action Type Old Value New Value
    Added 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()`.
    Added Reference https://git.kernel.org/stable/c/092fc76b7ab4163e008f9cde596a58dad2108260
    Added Reference https://git.kernel.org/stable/c/78b97783496b454435639937db3303e900a24d3f
    Added Reference https://git.kernel.org/stable/c/87c544108b612512b254c8f79aa5c0a8546e2cc4
    Added Reference https://git.kernel.org/stable/c/be42a09fe898635b0093c0c8dac1bfabe225c240
    Added Reference https://git.kernel.org/stable/c/eeef8e65041a031bd8a747a392c14b76a123a12c
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