Medium 5.5Published Feb 26, 2025

CVE-2025-21728bpf: Send signals asynchronously if !preemptible

Updated under an hour ago (Oct 26, 2026, 11:30 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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()`.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from fd29a0242f86b2d95ad666aa9f92a3d0f7bfdab6 before feba1308bc5e8e04cee751d39fae8a9b407a9034; from 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 before ce51eab2070e295d298f42a2f1db269cd1b56d55; from 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 before e306eaaa3d78b462db5f5b11e0171f9d2b6ca3f4; from 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 before be42a09fe898635b0093c0c8dac1bfabe225c240; from 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 before eeef8e65041a031bd8a747a392c14b76a123a12c; from 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 before 78b97783496b454435639937db3303e900a24d3f; from 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 before 092fc76b7ab4163e008f9cde596a58dad2108260; from 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 before 87c544108b612512b254c8f79aa5c0a8546e2cc4; and 3 more ranges	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.4.33 before 5.4.291; from 5.5.18 before 5.6; from 5.6.1 before 5.10.235; from 5.11 before 5.15.179; from 5.16 before 6.1.129; from 6.2 before 6.6.76; from 6.7 before 6.12.13; from 6.13 before 6.13.2; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/feba1308bc5e8e04cee751d39fae8a9b407a9034	patch
https://git.kernel.org/stable/c/ce51eab2070e295d298f42a2f1db269cd1b56d55	patch
https://git.kernel.org/stable/c/e306eaaa3d78b462db5f5b11e0171f9d2b6ca3f4	patch
https://git.kernel.org/stable/c/be42a09fe898635b0093c0c8dac1bfabe225c240	patch
https://git.kernel.org/stable/c/eeef8e65041a031bd8a747a392c14b76a123a12c	patch
https://git.kernel.org/stable/c/78b97783496b454435639937db3303e900a24d3f	patch
https://git.kernel.org/stable/c/092fc76b7ab4163e008f9cde596a58dad2108260	patch
https://git.kernel.org/stable/c/87c544108b612512b254c8f79aa5c0a8546e2cc4	patch
https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.