Bug 2348528 (CVE-2025-21728) - CVE-2025-21728 kernel: bpf: Send signals asynchronously if !preemptible
Summary: CVE-2025-21728 kernel: bpf: Send signals asynchronously if !preemptible
Keywords:
Status: NEW
Alias: CVE-2025-21728
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-02-27 03:02 UTC by OSIDB Bzimport
Modified: 2025-11-11 10:25 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2025:20518 0 None None None 2025-11-11 10:25:19 UTC

Description OSIDB Bzimport 2025-02-27 03:02:01 UTC 
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()`.
Comment 1 Michal Findra 2025-02-27 15:19:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022648-CVE-2025-21728-5da4@gregkh/T
Comment 2 errata-xmlrpc 2025-11-11 10:25:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:20518 https://access.redhat.com/errata/RHSA-2025:20518
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