CVE-2025-21728: linux
Vulnerability summary
CVE-2025-21728 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 11% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 52 · Related 50Timeline
- 27-02-2025PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
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()`.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.21%
Chance of exploitation in the next 30 days
Percentile
11%
Versus all other CVEs
30-day change
+0.01 pp
From 0.20% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu132 products
- linux< 5.4.0-216.236 | < 5.15.0-140.150 | < 6.8.0-64.67
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.4.0-1146.156 | < 5.15.0-1084.91 | < 6.8.0-1032.34
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ fd29a0242f86b2d95ad666aa9f92a3d0f7bfdab6, < feba1308bc5e8e04cee751d39fae8a9b407a9034 | ≥ 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494, < ce51eab2070e295d298f42a2f1db269cd1b56d55 | ≥ 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494, < e306eaaa3d78b462db5f5b11e0171f9d2b6ca3f4 | ≥ 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494, < be42a09fe898635b0093c0c8dac1bfabe225c240 | ≥ 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494, < eeef8e65041a031bd8a747a392c14b76a123a12c | ≥ 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494, < 78b97783496b454435639937db3303e900a24d3f | ≥ 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494, < 092fc76b7ab4163e008f9cde596a58dad2108260 | ≥ 1bc7896e9ef44fd77858b3ef0b8a6840be3a4494, < 87c544108b612512b254c8f79aa5c0a8546e2cc4 | 7930d01afb7281edd9782971e0cca6fe587c7a7b | ≥ 5.4.33, < 5.4.291 | ≥ 5.5.18, < 5.6 | 5.6
- linux_kernel≥ 5.4.33, < 5.4.291 | ≥ 5.5.18, < 5.6 | ≥ 5.6.1, < 5.10.235 | ≥ 5.11, < 5.15.179 | ≥ 5.16, < 6.1.129 | ≥ 6.2, < 6.6.76 | ≥ 6.7, < 6.12.13 | ≥ 6.13, < 6.13.2 | 5.6
Debian1 product
- linux< 6.1.129-1 | < 6.12.13-1
3 vendors · 135 products
