High 7.8Published Mar 12, 2025

CVE-2025-21863io_uring: prevent opcode speculation

Updated under an hour ago (Oct 26, 2026, 10:50 PM ET)

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It affects Linux and 5 other products. Add what you run to find out whether that includes you.

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

CVSS: 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 d3656344fea0339fb0365c8df4d2beba4e0089cd before 87e9eef43c758da267f6332678058a79764c7eba; from d3656344fea0339fb0365c8df4d2beba4e0089cd before 18eae8420081ef8e043ad455937bfb470ef08607; from d3656344fea0339fb0365c8df4d2beba4e0089cd before d261ead565a080e3411b0dd04e6d58a52471cac8; from d3656344fea0339fb0365c8df4d2beba4e0089cd before b9826e3b26ec031e9063f64a7c735449c43955e4; from d3656344fea0339fb0365c8df4d2beba4e0089cd before 506b9b5e8c2d2a411ea8fe361333f5081c56d23a; from d3656344fea0339fb0365c8df4d2beba4e0089cd before fdbfd52bd8b85ed6783365ff54c82ab7067bd61b; from d3656344fea0339fb0365c8df4d2beba4e0089cd before 1e988c3fe1264708f4f92109203ac5b1d65de50b	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 V3.1.6	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 V3.1.6	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 V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.6 before 6.6.80; from 6.7 before 6.12.17; from 6.13 before 6.13.5; 6.14; 6.14; 6.14	NVD

References

References

https://git.kernel.org/stable/c/87e9eef43c758da267f6332678058a79764c7eba
https://git.kernel.org/stable/c/18eae8420081ef8e043ad455937bfb470ef08607
https://git.kernel.org/stable/c/d261ead565a080e3411b0dd04e6d58a52471cac8
https://git.kernel.org/stable/c/b9826e3b26ec031e9063f64a7c735449c43955e4	patch
https://git.kernel.org/stable/c/506b9b5e8c2d2a411ea8fe361333f5081c56d23a	patch
https://git.kernel.org/stable/c/fdbfd52bd8b85ed6783365ff54c82ab7067bd61b	patch
https://git.kernel.org/stable/c/1e988c3fe1264708f4f92109203ac5b1d65de50b	patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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.