# CVE-2025-21863

## Summary

- **CVE ID:** CVE-2025-21863
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Mar 12, 2025
- **Last Modified:** Sep 8, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

io_uring: prevent opcode speculation

sqe->opcode is used for different tables, make sure we santitise it
against speculations.

## Affected Products

- Linux — Linux (d3656344fea0339fb0365c8df4d2beba4e0089cd)
- Linux — Linux (5.6)
- Linux — Linux (0)
- Linux — Linux (6.6.80)
- Linux — Linux (6.12.17)
- Linux — Linux (6.13.5)
- Linux — Linux (6.14)
- Linux — Linux (5.15.209)
- Linux — Linux (6.1.175)
- Linux — Linux (5.10.259)

## References

- [CNA](https://git.kernel.org/stable/c/b9826e3b26ec031e9063f64a7c735449c43955e4)
- [CNA](https://git.kernel.org/stable/c/506b9b5e8c2d2a411ea8fe361333f5081c56d23a)
- [CNA](https://git.kernel.org/stable/c/fdbfd52bd8b85ed6783365ff54c82ab7067bd61b)
- [CNA](https://git.kernel.org/stable/c/1e988c3fe1264708f4f92109203ac5b1d65de50b)
- [CNA](https://git.kernel.org/stable/c/18eae8420081ef8e043ad455937bfb470ef08607)
- [CNA](https://git.kernel.org/stable/c/d261ead565a080e3411b0dd04e6d58a52471cac8)
- [CNA](https://git.kernel.org/stable/c/87e9eef43c758da267f6332678058a79764c7eba)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-019113.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.23%
- **EPSS Percentile:** 14.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._