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CVE-2025-21863

io_uring: prevent opcode speculation

HIGH
7.8
CVSS Score
Published: March 12, 2025 at 09:42 AM UTC
Updated: October 15, 2026 at 02:17 AM UTC
4 products affected across 2 vendorsLinux KernelSIMATIC S7-1500 CPU 1518-4 Pn /dp MFP FirmwareSiplus S7-1500 CPU 1518-4 Pn /dp MFP Firmware

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Severity
HIGH7.8
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.6 ≤ v < 6.6.806.13 ≤ v < 6.13.56.7 ≤ v < 6.12.176.146.14 rc16.14 rc26.14 rc3d3656344fea0339fb0365c8df4d2beba4e0089cd
Vendor states this is fixed in 18eae8420081ef8e043ad455937bfb470ef08607 (fixed)
Vendor states this is fixed in 1e988c3fe1264708f4f92109203ac5b1d65de50b (fixed)
Vendor states this is fixed in 506b9b5e8c2d2a411ea8fe361333f5081c56d23a (fixed)
Vendor states this is fixed in 87e9eef43c758da267f6332678058a79764c7eba (fixed)
Vendor states this is fixed in b9826e3b26ec031e9063f64a7c735449c43955e4 (fixed)
Vendor states this is fixed in d261ead565a080e3411b0dd04e6d58a52471cac8 (fixed)
Vendor states this is fixed in fdbfd52bd8b85ed6783365ff54c82ab7067bd61b (fixed)
Vendor states this is fixed in 5.10.259 (unaffected)
Vendor states this is fixed in 5.15.209 (unaffected)
Vendor states this is fixed in 5.6 (unaffected)
Vendor states this is fixed in 6.1.175 (unaffected)
Vendor states this is fixed in 6.12.17 (unaffected)
Vendor states this is fixed in 6.13.5 (unaffected)
Vendor states this is fixed in 6.14 (unaffected)
Vendor states this is fixed in 6.6.80 (unaffected)
SIMATIC S7-1500 CPU 1518-4 Pn /dp MFP Firmware· Siemens
60%
v ≥ V3.1.63.1.6
SIMATIC S7-1500 CPU 1518F 4 Pn /dp MFP Firmware· Siemens
60%
v ≥ V3.1.63.1.6
Siplus S7-1500 CPU 1518-4 Pn /dp MFP Firmware· Siemens
60%
v ≥ V3.1.63.1.6

References (10)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/1e988c3fe1264708f4f92109203ac5b1d65de50b
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/506b9b5e8c2d2a411ea8fe361333f5081c56d23a
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/b9826e3b26ec031e9063f64a7c735449c43955e4
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/fdbfd52bd8b85ed6783365ff54c82ab7067bd61b
Source: cverecord
https://git.kernel.org/stable/c/18eae8420081ef8e043ad455937bfb470ef08607
Source: cverecord
https://git.kernel.org/stable/c/d261ead565a080e3411b0dd04e6d58a52471cac8
Source: cverecord
https://git.kernel.org/stable/c/87e9eef43c758da267f6332678058a79764c7eba
Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
https://cert-portal.siemens.com/productcert/html/ssa-019113.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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